St. Charles County, Missouri

County in Missouri, United States

"St. Charles County" redirects here. For the similarly-named Louisiana parish, see St. Charles Parish, Louisiana.

U.S. county in Missouri

St. Charles County

U.S. county

St. Charles County Courthouse in St. Charles

Flag

Location within the U.S. state of Missouri

Missouri's location within the U.S.

Country|  United States
State|  Missouri
Founded| October 1, 1812
Named for| Charles Borromeo
Seat| St. Charles
Largest city| O'Fallon
Government

• County executive| Steve Ehlmann (R)
Area

• Total| 593 sq mi (1,540 km2)
• Land| 560 sq mi (1,500 km2)
• Water| 32 sq mi (80 km2)  5.4%
Population

(2020)

• Total| 405,262
• Density| 680/sq mi (260/km2)
Time zone| UTC−6 (Central)
• Summer (DST)| UTC−5 (CDT)
Congressional districts| 2nd, 3rd
Website| www.sccmo.org

St. Charles County is in the central eastern part of the U.S. state of Missouri. As of the 2020 census, the population was 405,262,[1] making it Missouri's third-most populous county. Its county seat is St. Charles.[2] The county was organized October 1, 1812, and named for Saint Charles Borromeo, an Italian cardinal.

St. Charles County is part of the St. Louis, MO-IL Metropolitan Statistical Area and contains many of the city's northwestern suburbs. The wealthiest county in Missouri,[3] St. Charles County is one of the nation's fastest-growing counties.

St. Charles County includes a part of the Augusta AVA, an area of vineyards and wineries designated by the federal government in 1980 as the first American Viticultural Area.[4] The county's rural outer edge along the south-facing bluffs above the Missouri River, is also part of the broader Missouri Rhineland.

## Contents

* 1 History
* 2 Geography
* 2.1 Adjacent counties
* 2.2 Major highways
* 2.3 National protected area
* 3 Climate
* 4 Demographics
* 4.1 2020 Census
* 5 Education
* 5.1 Public schools
* 5.2 Private schools
* 5.3 Alternative schools
* 5.4 Higher education
* 5.5 Public libraries
* 6 Government
* 6.1 Law enforcement
* 7 Politics
* 7.1 Local
* 7.2 State
* 7.3 Federal
* 7.3.1 2016 Missouri presidential primary results
* 7.3.2 2012 Missouri presidential primary results
* 7.3.3 2008 Missouri presidential primary results
* 8 Communities
* 8.1 Cities
* 8.2 Villages
* 8.3 Census-designated place
* 8.4 Other unincorporated places
* 8.5 Islands
* 9 Subregions
* 9.1 Westplex
* 10 See also
* 11 References
* 12 External links

## History

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The County of St. Charles was originally called the District of St. Charles and had no definite limits until 1816 to 1818 when neighboring counties were formed.[5] The borders of St. Charles are the same today as they were in 1818.[6]

## Geography

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St. Charles County is the only known habitat of the threatened decurrent false aster in Missouri.[7]

According to the U.S. Census Bureau, the county has a total area of 593 square miles (1,540 km2), of which 560 square miles (1,500 km2) is land and 32 square miles (83 km2) (5.4%) is water.[8]

The highest elevation is 901 feet (275 m) northwest of Augusta near Femme Osage Creek headwaters.[9]

### Adjacent counties

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* Lincoln County (northwest)
* Calhoun County, Illinois (north)
* Jersey County, Illinois (northeast)
* Madison County, Illinois (east)
* St. Louis County (southeast)
* Franklin County (south)
* Warren County (west)

### Major highways

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* I-64 – Major freeway in the western portion of the county. Originally U.S. Route 40, the highway was upgraded to Interstate standards in the late 2000s. The highway was re-signed as Interstate 64 from the Daniel Boone Bridge to Interstate 70 in Wentzville in 2009.
* I-70 – The major east–west thoroughfare in the county. It is mostly a six-lane freeway in the county, but there are sections in St. Charles and St. Peters where the Interstate widens to 11 lanes of traffic.
* Interstate 70 Business
* US-40
* US-61
* US-67
* Rte-79
* Rte-94
* Rte-364 – A freeway in the southern and central portions of the county that begins at Interstate 270 in western St. Louis County and ends at Interstate 64 in Lake St. Louis.
* Rte-370 – A six-lane freeway that connects Interstate 70 in St. Charles County and Interstate 270 in St. Louis County.

### National protected area

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* Two Rivers National Wildlife Refuge (part)

## Climate

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|  Saint Charles County

Climate chart (explanation)

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2.6

3.2

3.7

8.5

4.4

4.9

1.9

4.2

3.6

1.8

Average max. and min. temperatures in °F
Precipitation totals in inches
Source: [10]
| Metric conversion

216

112

124

107

102

Average max. and min. temperatures in °C
Precipitation totals in mm

## Demographics

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Historical population

Census | Pop. |  | %±
1810| 3,505| | —
1820| 3,970| | 13.3%
1830| 4,320| | 8.8%
1840| 7,911| | 83.1%
1850| 11,454| | 44.8%
1860| 16,523| | 44.3%
1870| 21,304| | 28.9%
1880| 23,065| | 8.3%
1890| 22,977| | −0.4%
1900| 24,474| | 6.5%
1910| 24,695| | 0.9%
1920| 22,828| | −7.6%
1930| 24,354| | 6.7%
1940| 25,562| | 5.0%
1950| 29,834| | 16.7%
1960| 52,970| | 77.5%
1970| 92,954| | 75.5%
1980| 144,107| | 55.0%
1990| 212,907| | 47.7%
2000| 283,883| | 33.3%
2010| 360,485| | 27.0%
2020| 405,262| | 12.4%
U.S. Decennial Census[11]
1790–1960[12] 1900–1990[13]
1990–2000[14] 2010–2020[15]

As of 2020, there were 405,262 people and 150,668 households residing in the county. The population density was 643 inhabitants per square mile (248/km2). There were 161,144 housing units. The racial makeup of the county was 83.8% White, 5.2% African American, 0.1% Native American, 2.8% Asian, 0.1% Pacific Islander, and 6.5% from two or more races. Hispanic or Latino made up 4.0% of the population.[16]

There were 101,663 households, out of which 40.50% had children under the age of 18 living with them, 63.20% were married couples living together, 9.20% have a woman whose husband does not live with her, and 24.20% were non-families. 19.40% of all households were made up of individuals, and 5.90% had someone living alone who was 65 years of age or older. The average household size was 2.76 and the average family size was 3.18.

In the county, the population was spread out in age, with 29.00% under the age of 18, 8.20% from 18 to 24, 32.60% from 25 to 44, 21.60% from 45 to 64, and 8.80% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 97.10 males. For every 100 females age 18 and over, there were 94.10 males.

The median income for a household in the county was $71,458, and the median income for a family was $64,415. Males had a median income of $44,528 versus $29,405 for females. The per capita income for the county was $23,592. 4.00% of the population and 2.80% of families were below the poverty line. Out of the total people living in poverty, 4.90% are under the age of 18 and 5.10% are 65 or older.

St. Charles County has had one of the fastest-growing populations in the state for many decades, with 55% growth in the 1970s, 48% in the 1980s, 33% in the 1990s, and another 27% in the 2000s. The county sits at a cross-section of industry, as well as extensive retail and some agriculture. With the Missouri River on the south and east and the Mississippi River on the north, the county is bisected east to west by Interstate 70. After St. Charles Airport closed in 2010, the county has one remaining small airport, St. Charles County Smartt Airport. Two ferries cross the Mississippi River from St. Charles County.

Racial composition | 2010[17] | 2018[18]

|
|

White | 91.3% | 89.9%
—Non-Hispanic | 89.1% | 86.9%
Black or African American | 4.4% | 5.1%
Hispanic or Latino (of any race) | 2.9% | 3.4%
Asian | 2.3% | 2.7%
Two or More Races | 1.6% | 2.0%

### 2020 Census

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St. Charles County Racial Composition[19] Race  | Num.  | Perc.

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White (NH)  | 335,879  | 82.9%
Black or African American (NH)  | 20,672  | 5.1%
Native American (NH)  | 623  | 0.15%
Asian (NH)  | 11,068  | 2.73%
Pacific Islander (NH)  | 199  | 0.05%
Other/Mixed (NH)  | 20,810  | 5.13%
Hispanic or Latino | 16,011  | 4%

## Education

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### Public schools

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School districts include:[20]

* Fort Zumwalt R-II School District
* Francis Howell R-III School District
* Orchard Farm R-V School District
* St. Charles R-VI School District
* Washington School District
* Wentzville R-IV School District

High schools (all grades 9–12):

* Fort Zumwalt District

* Fort Zumwalt East High School – St. Peters
* Fort Zumwalt North High School – O'Fallon
* Fort Zumwalt South High School – St. Peters
* Fort Zumwalt West High School – O'Fallon

* Francis Howell District

* Francis Howell Central High School – Cottleville
* Francis Howell North High School – St. Peters
* Francis Howell High School – Weldon Spring Heights

* Orchard Farm District

* Orchard Farm High School – St. Charles

* St. Charles District

* St. Charles High School – St. Charles
* St. Charles West High School – St. Charles

* Wentzville District

* Liberty High School – Lake St. Louis
* Emil E. Holt High School – Wentzville
* Timberland High School – Wentzville

### Private schools

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* Academy of the Sacred Heart – St. Charles – (PK-08) – Roman Catholic
* All Saints School – St. Peters – (K-08) – Roman Catholic
* Assumption Catholic Grade School – O'Fallon – (K-08) – Roman Catholic
* Christian High School– O'Fallon and St. Peters– (PK-12) – Non-denominational Christian
* Duchesne High School– St. Charles– (09-12)– Roman Catholic
* First Baptist Christian Academy – O'Fallon – (PK-07) – Non-denominational Christian
* Foristell Baptist Academy – Foristell – (K-09) – Baptist
* Hope Montessori Academy – Lake St. Louis – (PK-K) – Nonsectarian
* Immaculate Conception Catholic School – Dardenne Prairie – (K-08) – Roman Catholic
* Immanuel Lutheran School – St. Charles – (PK-08) – Lutheran
* Immanuel Lutheran School – Wentzville – (PK-08) – Lutheran
* Liberty Classical School – O'Fallon – (07-12) – Non-denominational Christian
* Lutheran High School of St. Charles County – St. Peters – (09-12) – Lutheran
* Messiah Lutheran School – Weldon Spring – (PK-08) – Lutheran
* Mid Rivers Seventh-day Adventist School – St. Peters – (03-08) – Seventh-day Adventist
* St. Charles Borromeo – St. Charles – (K-08) – Roman Catholic
* St. Cletus School – St. Charles – (K-08) – Roman Catholic
* St. Dominic High School – O'Fallon – (09-12) – Roman Catholic
* St. Elizabeth St. Robert Regional School – St. Charles – (PK-08) – Roman Catholic
* St. Joseph School – Cottleville – (K-08) – Roman Catholic
* St. Joseph School – Wentzville – (PK-08) – Roman Catholic
* St. Patrick Elementary School – Wentzville – (K-08) – Roman Catholic
* St. Paul Elementary School – St. Paul – (PK-08) – Roman Catholic
* St. Peter Catholic School – St. Charles – (PK-08) – Roman Catholic
* St. Theodore School – Wentzville – (K-08) – Roman Catholic
* Sts. Joachim & Ann School – St. Charles – (PK-08) – Roman Catholic
* Trinity Lutheran School – St. Charles – (01-08) – Lutheran
* Willott Road Christian Academy – St. Peters – (NS-09) – Baptist
* Zion Lutheran School – St. Charles – (PK-08) – Lutheran

### Alternative schools

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* Boonslick State School – St. Peters – Special Education
* Fort Zumwalt Hope High School – O'Fallon – Other/Alternative School – (09-12)
* Francis Howell Union High School – St. Charles – Other/Alternative School – (09-12)
* Heritage Landing – St. Peters – Other/Alternative School – (06-12)
* The Lead School – O'Fallon – Other/Alternative School – (K-12)
* Lewis & Clark Career Center – St. Charles – Vocational/Technical School – (09-12)
* Quest Day Treatment Center – St. Charles – Other/Alternative School – (06-12)
* Success Campus – St. Charles – Other/Alternative School – (09-12)

### Higher education

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* Lindenwood University – St. Charles
* St. Charles Community College – Cottleville

### Public libraries

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* St. Charles City-County Library District[21]

## Government

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St. Charles County is governed by a county executive and a county council. The county council consists of seven members, each elected from various districts in the county. The county executive is elected by the entire county. The current executive is Steve Ehlmann. He was preceded by Joe Ortwerth, who was preceded by Gene Schwendemann, the first county executive of St. Charles County under the new form of government. The executive under the old form of county government was termed a "judge." The county had 258,525 registered voters as of March 2016.[22]

St. Charles County Ambulance District (SCCAD) is the largest such district in Missouri, serving all of St. Charles County and its population of nearly 370,000.

### Law enforcement

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The St. Charles County Sheriff's Department (SCCSD) is responsible for court services and security, prisoner transport, civil process, and bailiffs. Until the end of 2014, SCCSD was the primary law enforcement agency serving unincorporated areas of St. Charles County. On January 1, 2015, the St. Charles County Police Department was established and assumed that responsibility.[23] It should not be confused with the St. Charles City Police Department. The St. Charles County Regional SWAT Team is made up of officers from each county law enforcement agency.

The SCCSD Aviation Unit is part of a multi-jurisdictional unit known as the Metro Air Support Unit, with the Metropolitan Police Department, City of St. Louis, St. Louis County Police Department, and St. Charles County Sheriff's Department. In 2007, the fleet included six helicopters, one fixed-wing airplane, six pilots, and eight crew chiefs.[24]

## Politics

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### Local

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The Republican Party predominantly controls politics at the local level in St. Charles County. Republicans hold all the elected positions in the county.[25][26][27]

Position | Incumbent | Party

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Assessor  | Scott Shipman  | Republican
Collector  | Michelle McBride  | Republican
Council Member – District 1  | Joe Cronin  | Republican
Council Member – District 2  | Joseph Brazil  | Republican
Council Member – District 3  | Michael Elam  | Republican
Council Member – District 4  | David Hammond  | Republican
Council Member – District 5  | Terry Hollander  | Republican
Council Member – District 6  | Nancy Schneider  | Republican
Council Member – District 7  | John White  | Republican
County Executive  | Steve Ehlmann | Republican
Director of Elections  | Kurt Bahr | Republican
Prosecuting Attorney  | Tim Lohmar  | Republican[28]
Recorder  | Mary Dempsey  | Republican
Sheriff  | Scott Lewis  | Republican

### State

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Past Gubernatorial Elections Results Year  | Republican | Democratic | Third Parties

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2020 | 58.12% 128,230 | 39.84% 87,888 | 2.04% 4,496
2016 | 54.52% 103,946 | 42.58% 85,704 | 2.90% 5,836
2012 | 48.58% 89,144 | 48.97% 89,860 | 2.45% 4,486
2008 | 44.51% 82,440 | 53.84% 99,705 | 1.65% 3,058
2004 | 55.90% 91,323 | 42.96% 70,184 | 1.14% 1,865
2000 | 58.24% 74,357 | 39.49% 50,415 | 2.27% 2,907
1996 | 49.48% 47,886 | 48.01% 46,462 | 2.50% 2,424

St. Charles County is divided among twelve legislative districts in the Missouri State House of Representatives, all but one of which are held by Republicans.

* District 42 – Jeff Porter (R-Montgomery City, since 2019). Consists of Augusta, Defiance and part of New Melle.
* District 63 – Richard West (R-New Melle, since 2021). Consists of Wentzville, Foristell, and part of New Melle.
* District 64 – Tony Lovasco (R-O'Fallon, since 2019). Consists of Flint Hill, Josephville, St. Paul, and parts of O'Fallon and St. Peters.
* District 65 – vacant (since October 2021). Consists of West Alton, Portage Des Sioux, and part of St. Charles. Most recently represented by Tom Hannegan from 2017 until his death.
* District 70 – Paula Brown (D-Hazelwood, since 2019). Consists of parts of St. Charles and Weldon Spring.
* District 102 – Ron Hicks (R-St. Charles, since 2019). Consists of Weldon Springs Heights, and parts of O'Fallon, Dardenne Prairie, New Melle, and Weldon Spring.
* District 103 – John Wiemann (R-O'Fallon, since 2015). Consists of Cottleville and parts of O'Fallon, St. Peters, and Weldon Spring.
* District 104 – Adam Schnelting (R-St. Charles, since 2019). Consists of part of St. Charles and St. Peters.
* District 105 – Phil Christofanelli (R-St. Charles, since 2017). Consists of parts of St. Charles and St. Peters.
* District 106 – Adam Schwardon (R-St. Charles, since 2021). Consists of parts of St. Charles and St. Peters.
* District 107 – Nick Schroer (R-O'Fallon, since 2017). Consists of parts of Lake St. Louis, O'Fallon, and St. Peters.
* District 108 – vacant (January 2022). Consists of parts of Lake St. Louis and Dardenne Prairie. Most recently represented by Justin Hill until his resignation.

St. Charles County is divided into two districts in the Missouri State Senate, both of which have elected Republicans.

* District 2 – Bob Onder (R-Lake St. Louis, since 2015). Consists of the communities of Augusta, Dardenne Prairie, Flint Hill, Foristell, Josephville, Lake St. Louis, New Melle, O'Fallon, St. Paul, Weldon Spring Heights, and Wentzville.
* District 23 – Bill Eigel (R-Weldon Spring, since 2017). Consists of Portage Des Sioux, St. Charles, St. Peters, Weldon Spring, and West Alton.

### Federal

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Missouri is represented in the U.S. Senate by Roy Blunt and Josh Hawley, whose most recent election results from the county are included here.

U.S. Senate — Missouri — (2018)[29] Party  | Candidate  | Votes  | %

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| Republican | Josh Hawley | 93,172 | 52.90%
| Democratic | Claire McCaskill | 77,973  | 44.30%
| Independent | Craig O'Dear  | 2,393  | 1.40%
| Libertarian | Japheth Campbell  | 1,836  | 1.0%
| Green | Jo Crain  | 731  | 0.4%
Total votes  | 176,105  | 100%
U.S. Senate — Missouri — (2016)  Party  | Candidate  | Votes  | %  | ±%

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|
|
|

| Republican | Roy Blunt | 103,946 | 51.78% | +6.87
| Democratic | Jason Kander  | 88,238  | 43.95%  | -5.18
| Libertarian | Jonathan Dine  | 5,238  | 2.61%  | -3.35
| Green | Johnathan McFarland  | 1,970  | 0.98%  | +0.98
| Constitution | Fred Ryman  | 1,355  | 0.67%  | +0.67
U.S. Senate — Missouri — (2012)[30] Party  | Candidate  | Votes  | %

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|
|

| Democratic | Claire McCaskill | 89,993 | 49.10%
| Republican | Todd Akin  | 82,278  | 44.90%
| Libertarian | Jonathan Dine  | 10,924  | 6.0%
U.S. Senate — Missouri — (2010)[31] Party  | Candidate  | Votes  | %

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|
|

| Republican | Roy Blunt | 73,695 | 59.09%
| Democratic | Robin Carnahan  | 43,955  | 35.24%
| Libertarian | Jonathan Dine  | 10,924  | 6.0%

Part of St. Charles County is included in Missouri's 2nd Congressional District and is currently represented by Ann Wagner in the U.S. House of Representatives.

U.S. House of Representatives — Missouri's 2nd Congressional District — St. Charles County (2020)  Party  | Candidate  | Votes  | %  | ±%

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|
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| Republican | Ann Wagner | 45,941 | 57.38% |
| Democratic | Jill Schupp  | 31,239  | 39.02%  |
| Libertarian | Martin Schulte  | 2,821  | 3.52%  |
U.S. House of Representatives — Missouri's 2nd Congressional District — St. Charles County (2018)[29] Party  | Candidate  | Votes  | %  | ±%

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|
|
|

| Republican | Ann Wagner  | 37,875  | 57.5%
| Democratic | Cort VanOstran  | 26,782  | 40.6%
| Libertarian | Tony Kirk  | 956  | 1.5%
| Green | David Arnold  | 304  | 0.5%
| Independent | Ken Newhouse (write-in)  | 0  | 0.0%
Total votes  | 65,917  | 100.0%
| Republican hold

Most of St. Charles County is included in Missouri's 3rd Congressional District and is currently represented by Blaine Luetkemeyer (R-St. Elizabeth) in the U.S. House of Representatives.

U.S. House of Repersentatives — Missouri's 3rd Congressional District — St. Charles County (2020)  Party  | Candidate  | Votes  | %  | ±%

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| Republican | Blaine Luuetkemeyer | 84,071 | 61.74% |
| Democratic | Megan Rezabek  | 49,315  | 36.22%  |
| Libertarian | Leonard J Steinman II  | 2,631  | 1.93%  |
U.S. House of Representatives — Missouri's 3rd Congressional District — St. Charles County (2018)[29] Party  | Candidate  | Votes  | %  | ±%

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|
|

| Republican | Blaine Luetkemeyer  | 61,751  | 57.77%
| Democratic | Katy Geppert  | 43,070  | 40.30%  |
| Libertarian | Donald V. Stolle  | 2,062  | 1.93%  |
Total votes  | 106,883  | 100.0%
| Republican hold
United States presidential election results for St. Charles County, Missouri[32] Year  | Republican | Democratic | Third party

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No. | % | No. | % | No. | %
2020 | 128,389  | 57.83% | 89,530  | 40.33%  | 4,098  | 1.85%
2016 | 121,650  | 59.87% | 68,626  | 33.78%  | 12,908  | 6.35%
2012 | 110,784  | 59.44% | 71,838  | 38.55%  | 3,744  | 2.01%
2008 | 102,550  | 54.27% | 84,183  | 44.55%  | 2,224  | 1.18%
2004 | 95,826  | 58.61% | 66,855  | 40.89%  | 807  | 0.49%
2000 | 72,114  | 56.04% | 53,806  | 41.81%  | 2,766  | 2.15%
1996 | 47,705  | 46.66% | 41,369  | 40.46%  | 13,172  | 12.88%
1992 | 38,673  | 36.29% | 37,263  | 34.97%  | 30,627  | 28.74%
1988 | 50,005  | 62.90% | 29,286  | 36.84%  | 209  | 0.26%
1984 | 47,784  | 73.06% | 17,617  | 26.94%  | 0  | 0.00%
1980 | 36,050  | 60.32% | 20,668  | 34.58%  | 3,050  | 5.10%
1976 | 26,105  | 53.60% | 22,063  | 45.30%  | 536  | 1.10%
1972 | 25,677  | 69.94% | 11,034  | 30.06%  | 0  | 0.00%
1968 | 13,533  | 45.63% | 10,374  | 34.98%  | 5,752  | 19.39%
1964 | 9,020  | 38.30%  | 14,530  | 61.70% | 0  | 0.00%
1960 | 10,888  | 47.80%  | 11,890  | 52.20% | 0  | 0.00%
1956 | 9,462  | 55.40% | 7,618  | 44.60%  | 0  | 0.00%
1952 | 8,451  | 56.48% | 6,493  | 43.39%  | 20  | 0.13%
1948 | 5,976  | 49.54%  | 6,049  | 50.14% | 39  | 0.32%
1944 | 7,050  | 58.92% | 4,880  | 40.78%  | 36  | 0.30%
1940 | 7,792  | 59.14% | 5,334  | 40.48%  | 50  | 0.38%
1936 | 5,156  | 42.72%  | 5,903  | 48.91% | 1,009  | 8.36%
1932 | 3,664  | 34.12%  | 6,911  | 64.37% | 162  | 1.51%
1928 | 5,404  | 51.43% | 5,081  | 48.36%  | 22  | 0.21%
1924 | 4,668  | 59.11% | 2,364  | 29.94%  | 865  | 10.95%
1920 | 6,645  | 72.13% | 2,472  | 26.83%  | 96  | 1.04%
1916 | 3,518  | 64.16% | 1,914  | 34.91%  | 51  | 0.93%
1912 | 2,350  | 49.00% | 1,792  | 37.36%  | 654  | 13.64%
1908 | 3,480  | 62.84% | 1,979  | 35.73%  | 79  | 1.43%
1904 | 3,203  | 62.91% | 1,788  | 35.12%  | 100  | 1.96%
1900 | 3,324  | 58.10% | 2,343  | 40.95%  | 54  | 0.94%
1896 | 3,173  | 56.15% | 2,448  | 43.32%  | 30  | 0.53%
1892 | 2,522  | 50.00% | 2,485  | 49.27%  | 37  | 0.73%
1888 | 2,668  | 52.65% | 2,381  | 46.99%  | 18  | 0.36%

#### 2016 Missouri presidential primary results

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Republican

Donald Trump won the most votes in St. Charles County, with 41.50 percent. U.S. Senator Ted Cruz (R-Texas) came in second with 38.87 percent, Governor John Kasich (R-Ohio) placed third with 10.70 percent, and U.S. Senator Marco Rubio (R-Florida) was fourth with 7.10 percent.

Democratic

U.S. Senator Bernie Sanders (I-Vermont) won the primary with 54.32 percent to former Secretary of State Hillary Clinton's 44.80 percent.

#### 2012 Missouri presidential primary results

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Republican

Former U.S. Senator Rick Santorum (R-Pennsylvania) won the most votes in St. Charles County, with 56.29 percent. Former Governor Mitt Romney (R-Massachusetts) came in second with 25.43 percent, and former U.S. Representative Ron Paul (R-Texas) was third with 12.69 percent.

Democratic

With incumbent President Barack Obama facing no serious opposition, few St. Charles County voters voted in the Democratic primary; Obama won 87.83 percent.

#### 2008 Missouri presidential primary results

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Main article: 2008 Missouri Republican presidential primary

Republican

Former Governor Mitt Romney (R-Massachusetts) won the most votes in St. Charles County, with 37.72 percent. U.S. Senator John McCain (R-Arizona) came in second with 34.95 percent, former Governor Mike Huckabee (R-Arkansas) placed third with 21.83 percent, and U.S. Representative Ron Paul (R-Texas) was fourth with 3.83 percent.

Main article: 2008 Missouri Democratic presidential primary

Democratic

Former U.S. Senator Hillary Clinton (D-New York) received a total of 23,611 votes, more than any candidate from either party in St. Charles County during the 2008 presidential primary.

## Communities

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### Cities

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* Augusta
* Cottleville
* Dardenne Prairie
* Flint Hill
* Foristell
* Lake St. Louis
* New Melle
* O'Fallon
* Portage Des Sioux
* St. Charles (county seat)
* St. Paul
* St. Peters
* Weldon Spring
* Wentzville
* West Alton

### Villages

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* Josephville
* Weldon Spring Heights

### Census-designated place

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* Defiance

### Other unincorporated places

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* Black Walnut
* Blase
* Boschertown
* Cappeln
* Elm Point
* Enon
* Femme Osage
* Gilmore
* Harvester
* Howell
* Kampville
* Klondike
* Marais Croche
* Matson
* Mechanicsville
* Nona
* Orchard Farm
* Pauldingville
* Peruque
* Schluersburg
* Toonerville
* Whitecorn

### Islands

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* Apple Island
* Dresser Island
* Ellis Island
* Howell Island
* Two Branch Island

## Subregions

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### Westplex

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Westplex is an area within St. Charles County in east-central Missouri to the west of St. Louis County.[33]

The Westplex is part of St. Charles County that used to be called "The Golden Triangle". The "triangle" was formed by I-70 to the north, Missouri Route 94 to the southeast, and I-64 to the southwest. Since almost all of the growth in St. Charles County was within this triangle it was dubbed the "Golden" area of St. Charles county, hence, Golden Triangle. Today the Westplex is made up of St. Charles, St. Peters, Weldon Spring, Cottleville, Dardenne Prairie, O'Fallon, Lake St. Louis, and Wentzville.

## See also

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* List of counties in Missouri
* National Register of Historic Places listings in St. Charles County, Missouri

## References

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1. ^ "2020 U.S. Census". United States Census Bureau.
2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
3. ^ "County-Level Unemployment and Median Household Income for Missouri". www.ers.usda.gov. USDA Economic Research Service. Retrieved March 30, 2009.
4. ^ Pingelton, Tim (December 8, 2005). "The Soul of Augusta". Appellation American. Archived from the original on July 24, 2008.
5. ^ Bryan, William S. (1993). St. Charles Co., Missouri: biographical sketches from pioneer families of Missouri by Bryan and Rose. Baltimore, Maryland: Genealogical Publishing Company. p. 1.
6. ^ "MO: Individual County Chronology". Newberry. Retrieved October 8, 2020.
7. ^ "Decurrent False Aster". Field Guide. Missouri Dept. of Conservation. Retrieved September 2, 2015.
8. ^ "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Archived from the original on October 21, 2013. Retrieved November 20, 2014.
9. ^ USGS 1/3 Arc Second NED
10. ^ "NASA Earth Observations Data Set Index". NASA. Archived from the original on May 11, 2020. Retrieved January 30, 2016.
11. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved November 20, 2014.
12. ^ "Historical Census Browser". University of Virginia Library. Retrieved November 20, 2014.
13. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved November 20, 2014.
14. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Retrieved November 20, 2014.
15. ^ "2020 Population and Housing State Data". U.S. Census Bureau. Retrieved August 28, 2021.
16. ^ "St. Charles County, Missouri". United States Census Bureau. Retrieved January 9, 2022.
17. ^ "American Fact Finder". U.S. Census.[dead link]
18. ^ "QuickFacts. St. Charles County, Missouri". United States Census Bureau. Retrieved August 9, 2019.
19. ^ "P2 Hispanic or Latino, and Not Hispanic or Lationo by Race – 2020: DEC Redistricting Data (PL 94-171) – St. Charles County, Missouri".
20. ^ "2020 Census - School District Reference Map: St. Charles County, MO" (PDF). U.S. Census Bureau. Retrieved July 22, 2022. \- Text list
21. ^ Breeding, Marshall. "Saint Charles City – County Public Library". Libraries.org. Retrieved May 8, 2017.
22. ^ "Presidential Preference Primary, March 15, 2016, St. Charles County Missouri". St. Charles County Election Authority. March 22, 2016. Retrieved March 30, 2016.
23. ^ Schlinkmann, Mark (December 30, 2014). "New St. Charles County police department begins operations Thursday". STLtoday.com. Retrieved June 28, 2017.
24. ^ "Metro Airborne Law Enforcement of St. Louis, Mo".
25. ^ "November 2018 General Election".`{{cite web}}`: CS1 maint: url-status (link)
26. ^ "November 3, 2020 General Election".
27. ^ "County Council". St. Charles County, Missouri. Retrieved March 9, 2022.
28. ^ Korando, Russell (November 23, 2012). "St. Charles County judge nominated for prosecutor". St. Charles County Suburban Journal. Retrieved December 3, 2013. "Ehlmann was required to appoint someone from the same political party as Banas, a Republican, to serve until the office comes up for election in November 2014."
29. ^ a b c "County Results". Election Night Reporting. Missouri Secretary of State. Retrieved March 4, 2019.
30. ^ "2012 Missouri Senate Results". POLITICO.
31. ^ "St. Charles County 2010 Election Results".
32. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved March 26, 2018.
33. ^ "About Westplex". westplex.com. Retrieved October 20, 2017.

## External links

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* St. Charles County Government Website
* St. Charles City-County Library District
* St. Charles County Ambulance District
* Greater St. Charles County Chamber of Commerce
* St. Charles County Jail Information
* Digitized 1930 Plat Book of St. Charles County Archived August 16, 2011, at the Wayback Machine from University of Missouri Division of Special Collections, Archives, and Rare Books

* v
* t
* e

Municipalities and communities of St. Charles County, Missouri, United States

County seat: St. Charles

Cities|

* Augusta
* Cottleville
* Dardenne Prairie
* Flint Hill
* Foristell‡
* Lake St. Louis
* New Melle
* O'Fallon
* Portage Des Sioux
* St. Charles
* St. Paul
* St. Peters
* Weldon Spring
* Wentzville
* West Alton

Map of Missouri highlighting St. Charles County

Villages|

* Josephville
* Weldon Spring Heights

Townships|

* Blanchette
* Boone
* Cottleville
* Dardenne
* Friedens
* Frontier
* Harvester
* Lindenwood
* O'Fallon
* Rivers
* St. Peters
* Spencer Creek
* Wentzville
* Zumbehl

CDP|

* Defiance

Other
communities|

* Black Walnut
* Blase
* Boschertown
* Cappeln
* Elm Point
* Enon
* Femme Osage
* Gilmore
* Harvester
* Howell
* Kampville
* Klondike
* Marais Croche
* Matson
* Mechanicsville
* Nona
* Orchard Farm
* Pauldingville
* Peruque
* Schluersburg
* Toonerville
* Whitecorn

Ghost towns|

* Firma
* Hamburg
* Machens
* Wilkie

Footnotes|

‡This populated place also has portions in an adjacent county or counties

* United States portal

Places adjacent to St. Charles County, Missouri

| Lincoln County | Calhoun County, Illinois | Jersey County, Illinois

|
|

|  |
Warren County |

St. Charles County, Missouri

| Madison County, Illinois
|  |
| Franklin County | St. Louis County

* v
* t
* e

State of Missouri

Jefferson City (capital)

Topics|

* Index
* Geography
* Government
* Delegations
* History
* Battles
* Civil War
* People
* Symbols
* Tourist attractions
* Transportation

Society|

* Culture
* Crime
* Demographics
* Economy
* Education
* Politics

Regions|

* Boonslick
* Bootheel
* Four State Area
* Honey Lands
* Lead Belt
* Lincoln Hills
* Little Dixie
* Loess Hills
* Mid-Missouri
* Mississippi Embayment
* Missouri Rhineland
* Northern Plains
* Osage Plains
* The Ozarks
* Platte Purchase
* Pony Express
* St. Francois Mountains

Metro areas|

* Columbia
* Jefferson City
* Joplin
* Kansas City
* Springfield
* St. Joseph
* St. Louis

Largest cities|

* Kansas City
* St. Louis
* Springfield
* Columbia
* Independence
* Lee's Summit
* O'Fallon
* St. Joseph
* St. Charles
* Blue Springs
* St. Peters
* Florissant
* Joplin
* Chesterfield
* Wentzville
* Jefferson City
* Cape Girardeau
* Wildwood
* University City
* Ballwin
* Liberty
* Raytown
* Kirkwood
* Maryland Heights
* Gladstone
* Grandview
* Hazelwood

Counties and
independent cities|

* Adair
* Andrew
* Atchison
* Audrain
* Barry
* Barton
* Bates
* Benton
* Bollinger
* Boone
* Buchanan
* Butler
* Caldwell
* Callaway
* Camden
* Cape Girardeau
* Carroll
* Carter
* Cass
* Cedar
* Chariton
* Christian
* Clark
* Clay
* Clinton
* Cole
* Cooper
* Crawford
* Dade
* Dallas
* Daviess
* DeKalb
* Dent
* Douglas
* Dunklin
* Franklin
* Gasconade
* Gentry
* Greene
* Grundy
* Harrison
* Henry
* Hickory
* Holt
* Howard
* Howell
* Iron
* Jackson
* Jasper
* Jefferson
* Johnson
* Knox
* Laclede
* Lafayette
* Lawrence
* Lewis
* Lincoln
* Linn
* Livingston
* Macon
* Madison
* Maries
* Marion
* McDonald
* Mercer
* Miller
* Mississippi
* Moniteau
* Monroe
* Montgomery
* Morgan
* New Madrid
* Newton
* Nodaway
* Oregon
* Osage
* Ozark
* Pemiscot
* Perry
* Pettis
* Phelps
* Pike
* Platte
* Polk
* Pulaski
* Putnam
* Ralls
* Randolph
* Ray
* Reynolds
* Ripley
* St. Charles
* St. Clair
* St. Francois
* St. Louis (City)
* St. Louis (County)
* Ste. Genevieve
* Saline
* Schuyler
* Scotland
* Scott
* Shannon
* Shelby
* Stoddard
* Stone
* Sullivan
* Taney
* Texas
* Vernon
* Warren
* Washington
* Wayne
* Webster
* Worth
* Wright

* v
* t
* e

Greater St. Louis

* Illinois
* Missouri
* United States of America

Topics|

* Culture
* Crime
* Economy
* Education
* History
* Parks
* Transportation

Central city|

* St. Louis

Largest cities
(over 50,000 in 2020)|

* Chesterfield
* Florissant
* O'Fallon (Missouri)
* St. Charles
* St. Peters

Medium-sized cities
(over 20,000 in 2020)|

* Affton CDP
* Alton
* Arnold
* Ballwin
* Belleville
* Cahokia Heights
* Collinsville
* Edwardsville
* Granite City
* Hazelwood
* Kirkwood
* Maryland Heights
* Mehlville CDP
* Oakville CDP
* O'Fallon (Illinois)
* University City
* Webster Groves
* Wentzville
* Wildwood

Largest towns
and villages
(over 10,000 in 2020)|

* Bellefontaine Neighbors
* Bridgeton
* Clayton
* Columbia
* Concord CDP
* Crestwood
* Creve Coeur
* Dardenne Prairie
* East St. Louis
* Fairview Heights
* Farmington
* Ferguson
* Festus
* Glen Carbon
* Godfrey
* Highland
* Jennings
* Lake St. Louis
* Lemay CDP
* Manchester
* Overland
* Old Jamestown CDP
* St. Ann
* Shiloh
* Spanish Lake CDP
* Swansea
* Town and Country
* Troy (Illinois)
* Troy (Missouri)
* Union
* Washington
* Waterloo
* Wood River

Missouri counties|

* Franklin
* Jefferson
* Lincoln
* St. Charles
* St. Francois
* St. Louis City
* St. Louis County
* Warren
* Washington

Illinois counties|

* Bond
* Calhoun
* Clinton
* Jersey
* Macoupin
* Madison
* Monroe
* St. Clair

Subregions|

* Metro East
* Westplex

*[Pop.]: Population
*[%±]: Percent change
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