Washington County, Idaho

County in Idaho, United States

County in Idaho

Washington County

County

Washington County Courthouse in Weiser

Seal

Location within the U.S. state of Idaho

Idaho's location within the U.S.

Coordinates: 44°27′N 116°47′W﻿ / ﻿44.45°N 116.78°W﻿ / 44.45; -116.78
Country|  United States
State|  Idaho
Founded| February 20, 1879
Named after| George Washington
Seat| Weiser
Largest city| Weiser
Area

• Total

| 1,474 sq mi (3,820 km2)
• Land| 1,453 sq mi (3,760 km2)
• Water| 21 sq mi (50 km2)  1.4%
Population

(2020)

• Total

| 10,500

• Estimate

(2024)

| 11,539
• Density| 7.1/sq mi (2.8/km2)
Time zone| UTC−7 (Mountain)
• Summer (DST)| UTC−6 (MDT)
Congressional district| 1st
Website| www.co.washington.id.us

Washington County is a county in the U.S. state of Idaho. As of the 2020 census, the population was 10,500.[1] The county seat and largest city is Weiser,[2] with over half of the county's population. The county was established in 1879 when Idaho was a territory and named after U.S. President George Washington.

## Geography

[edit]

According to the U.S. Census Bureau, the county has a total area of 1,474 square miles (3,820 km2), of which 1,453 square miles (3,760 km2) is land and 21 square miles (54 km2) (1.4%) is water.[3]

### Adjacent counties

[edit]

* Adams County \- north
* Gem County \- east
* Payette County \- south
* Malheur County, Oregon \- southwest
* Baker County, Oregon \- west

### Major highways

[edit]

* US 95
* SH-71

### National protected areas

[edit]

* Boise National Forest (part)
* Deer Flat National Wildlife Refuge (part)
* Payette National Forest (part)

### Rivers

[edit]

* Snake River
* Weiser River

### Reservoirs

[edit]

* Brownlee
* Crane Creek
* Mann Creek
* Paddock Valley

## Demographics

[edit]

Historical population Census| Pop.| Note| %±

|
|
|

1880| 879| | —
1890| 3,836| | 336.4%
1900| 6,882| | 79.4%
1910| 11,101| | 61.3%
1920| 9,424| | −15.1%
1930| 7,962| | −15.5%
1940| 8,853| | 11.2%
1950| 8,576| | −3.1%
1960| 8,378| | −2.3%
1970| 7,633| | −8.9%
1980| 8,803| | 15.3%
1990| 8,550| | −2.9%
2000| 9,977| | 16.7%
2010| 10,198| | 2.2%
2020| 10,500| | 3.0%
2024 (est.)| 11,539| [4]| 9.9%
U.S. Decennial Census[5]
1790–1960,[6] 1900–1990,[7]
1990–2000,[8] 2010[9]

### 2020 census

[edit]

As of the census[10] of 2020, there were 10,500 people in 4,112 households living in the county. The population density was 7 people per square mile (2.7 people/km2). There were 4,138 housing units at an average density of 3 units per square mile (1.2 units/km2). The racial makeup of the county was 87.61% White, 1.03% Asian, 0.66% Native American, 0.10% Black or African American, 0.07% Pacific Islander, 8.17% from other races, and 2.36% from two or more races. 13.75% of the population were Hispanic or Latino of any race. 15.7% were of German, 14.3% English, 10.1% American and 7.7% Irish ancestry.

There were 3,762 households, out of which 32.7% had children under the age of 18 living with them, 60.7% were married couples living together, 8.2% had a female householder with no husband present, and 27.2% were non-families. 23.5% of all households were made up of individuals, and 13.30% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.10.

In the county, the population was spread out, with 27.4% under the age of 18, 7.20% from 18 to 24, 23.4% from 25 to 44, 24.3% from 45 to 64, and 17.70% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 95.80 males. For every 100 females age 18 and over, there were 93.0 males.

The median income for a household in the county was $30,625, and the median income for a family was $35,542. Males had a median income of $27,222 versus $18,053 for females. The per capita income for the county was $15,464. About 10.00% of families and 13.30% of the population were below the poverty line, including 16.60% of those under age 18 and 9.90% of those age 65 or over.

### 2010 census

[edit]

As of the 2010 United States census, there were 10,198 people, 4,034 households, and 2,803 families living in the county.[11] The population density was 7.0 inhabitants per square mile (2.7/km2). There were 4,529 housing units at an average density of 3.1 units per square mile (1.2 units/km2).[12] The racial makeup of the county was 86.6% white, 1.0% American Indian, 0.9% Asian, 0.2% black or African American, 9.1% from other races, and 2.2% from two or more races. Those of Hispanic or Latino origin made up 16.8% of the population.[11] In terms of ancestry, 20.0% were English, 18.2% were German, 14.8% were Irish, and 9.6% were American.[13]

Of the 4,034 households, 30.4% had children under the age of 18 living with them, 54.9% were married couples living together, 9.7% had a female householder with no husband present, 30.5% were non-families, and 25.8% of all households were made up of individuals. The average household size was 2.50 and the average family size was 2.99. The median age was 43.6 years.[11]

The median income for a household in the county was $36,542 and the median income for a family was $46,970. Males had a median income of $36,765 versus $26,406 for females. The per capita income for the county was $20,015. About 10.9% of families and 13.2% of the population were below the poverty line, including 15.6% of those under age 18 and 9.6% of those age 65 or over.[14]

### 2020 census

[edit]

Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.

Washington County racial composition
(NH = Non-Hispanic)[15][16] Race  | Pop 2010  | Pop 2020  | % 2010  | % 2020

|
|
|
|

White (NH)  | 8,166  | 8,118  | 80.07%  | 77.31%
Black or African American (NH)  | 10  | 17  | 0.1%  | 0.16%
Native American or Alaska Native (NH)  | 75  | 74  | 0.74%  | 0.7%
Asian (NH)  | 90  | 81  | 0.88%  | 0.77%
Pacific Islander (NH)  | 3  | 7  | 0.03%  | 0.07%
Some Other Race (NH)  | 12  | 53  | 0.12%  | 0.5%
Mixed/Multi-Racial (NH)  | 126  | 488  | 1.24%  | 4.65%
Hispanic or Latino | 1,716  | 1,662  | 16.83%  | 15.83%
Total | 10,198 | 10,500 |  |

As of the 2020 United States census, there were 10,500 people, 4,035 households, and 2,708 families residing in the county.

## Education

[edit]

The county is served by three school districts based in the county:[17]

* Weiser District #431[18]
* Weiser High School
* Weiser Middle School
* Park Intermediate School
* Pioneer Primary School.
* Cambridge Joint District #432[17]
* Cambridge Junior-Senior High School
* Cambridge Elementary School
* Midvale District #433[19]
* Midvale Senior High School.
* Midvale Junior High School
* Midvale Elementary School

Additionally Payette Joint School District 371 includes a portion of Washington County.[20]

Washington County is in the area (but not the taxing region) of the College of Western Idaho, which has its main campus in Nampa.[21]

## Communities

[edit]

### Cities

[edit]

* Cambridge
* Midvale
* Weiser

## Politics

[edit]

United States presidential election results for Washington County, Idaho[22] Year  | Republican | Democratic | Third party(ies)

|
|
|

No.  | % | No.  | % | No.  | %
2024 | 4,429  | 79.73% | 1,010  | 18.18%  | 116  | 2.09%
2020 | 4,154  | 77.70% | 1,073  | 20.07%  | 119  | 2.23%
2016 | 3,283  | 73.69% | 776  | 17.42%  | 396  | 8.89%
2012 | 3,128  | 72.22% | 1,104  | 25.49%  | 99  | 2.29%
2008 | 3,168  | 70.31% | 1,241  | 27.54%  | 97  | 2.15%
2004 | 3,274  | 75.11% | 1,033  | 23.70%  | 52  | 1.19%
2000 | 2,899  | 71.23% | 980  | 24.08%  | 191  | 4.69%
1996 | 2,318  | 54.90% | 1,314  | 31.12%  | 590  | 13.97%
1992 | 1,802  | 42.09% | 1,122  | 26.21%  | 1,357  | 31.70%
1988 | 2,380  | 61.98% | 1,359  | 35.39%  | 101  | 2.63%
1984 | 3,015  | 71.99% | 1,119  | 26.72%  | 54  | 1.29%
1980 | 2,915  | 63.58% | 1,421  | 30.99%  | 249  | 5.43%
1976 | 2,044  | 53.47% | 1,693  | 44.28%  | 86  | 2.25%
1972 | 2,264  | 61.99% | 935  | 25.60%  | 453  | 12.40%
1968 | 2,020  | 57.65% | 1,033  | 29.48%  | 451  | 12.87%
1964 | 1,730  | 46.99%  | 1,952  | 53.01% | 0  | 0.00%
1960 | 2,251  | 55.86% | 1,779  | 44.14%  | 0  | 0.00%
1956 | 2,272  | 57.89% | 1,653  | 42.11%  | 0  | 0.00%
1952 | 2,616  | 64.91% | 1,411  | 35.01%  | 3  | 0.07%
1948 | 1,713  | 49.21% | 1,700  | 48.84%  | 68  | 1.95%
1944 | 2,002  | 51.95% | 1,849  | 47.98%  | 3  | 0.08%
1940 | 1,903  | 45.27%  | 2,296  | 54.61% | 5  | 0.12%
1936 | 1,234  | 34.70%  | 2,147  | 60.38% | 175  | 4.92%
1932 | 1,213  | 34.65%  | 2,122  | 60.61% | 166  | 4.74%
1928 | 1,973  | 66.39% | 974  | 32.77%  | 25  | 0.84%
1924 | 1,183  | 41.33% | 623  | 21.77%  | 1,056  | 36.90%
1920 | 1,864  | 59.59% | 1,264  | 40.41%  | 0  | 0.00%
1916 | 1,545  | 44.43%  | 1,802  | 51.83% | 130  | 3.74%
1912 | 724  | 25.32%  | 1,065  | 37.25% | 1,070  | 37.43%
1908 | 1,819  | 51.56% | 1,452  | 41.16%  | 257  | 7.28%
1904 | 1,894  | 60.69% | 931  | 29.83%  | 296  | 9.48%
1900 | 1,194  | 46.95%  | 1,349  | 53.05% | 0  | 0.00%
1896 | 204  | 19.62%  | 828  | 79.62% | 8  | 0.77%
1892 | 317  | 36.15%  | 0  | 0.00%  | 560  | 63.85%

## Healthcare

[edit]

The county is served by the Southwest Idaho Health District.[23]

## See also

[edit]

* National Register of Historic Places listings in Washington County, Idaho

## References

[edit]

1. ^ "Washington County, Idaho". United States Census Bureau. Retrieved June 25, 2023.
2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
3. ^ "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. February 12, 2011. Retrieved April 23, 2011.
4. ^ "County Population Totals and Components of Change: 2020-2024". United States Census Bureau. Retrieved May 17, 2025.
5. ^ "U.S. Decennial Census". United States Census Bureau. Retrieved July 1, 2014.
6. ^ "Historical Census Browser". University of Virginia Library. Retrieved July 1, 2014.
7. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Retrieved July 1, 2014.
8. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on March 27, 2010. Retrieved July 1, 2014.
9. ^ "State & County QuickFacts". United States Census Bureau. Retrieved July 1, 2014.
10. ^ "U.S. Census website". United States Census Bureau. Retrieved December 1, 2023.
11. ^ a b c "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 9, 2016.
12. ^ "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 9, 2016.
13. ^ "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 9, 2016.
14. ^ "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved January 9, 2016.
15. ^ "Explore Census Data". data.census.gov. Retrieved March 15, 2022.
16. ^ "Explore Census Data". data.census.gov. Retrieved March 15, 2022.
17. ^ a b Education, Idaho State Department of (April 15, 2009). "Idaho Educational Directory 2008-09" (PDF). Retrieved May 26, 2009.
18. ^ District, Weiser School (2008). "Welcome to Weiser Schools!". Retrieved May 26, 2009.
19. ^ District, Midvale School (2009). "Home". Retrieved May 26, 2009.
20. ^ "2020 CENSUS - SCHOOL DISTRICT REFERENCE MAP: Washington County, ID" (PDF). U.S. Census Bureau. Archived (PDF) from the original on July 29, 2022. Retrieved July 29, 2022. \- Text list
21. ^ "College of Western Idaho, pg. 1-77" (PDF). Idaho Legislature. January 26, 2022. Retrieved March 12, 2024. \- See the map. Also see area 3 in: "TITLE 33 EDUCATION CHAPTER 21 JUNIOR COLLEGES". Idaho Legislature. Retrieved March 12, 2024.
22. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved April 4, 2018.
23. ^ Luchetta, Julie; Oppie, Troy (October 23, 2024). "Southwest Idaho Health District Board pulls COVID vaccines from its clinics". Boise State Public Radio. Retrieved October 27, 2024.

## External links

[edit]

* Official website
* County Parcel Map
* State of Idaho official site \- Washington County

* v
* t
* e

Places adjacent to Washington County, Idaho

|  | Adams County |

|
|

|  |
Baker County, Oregon |

Washington County, Idaho

| Gem County
|  |
Malheur County, Oregon | Payette County |

* v
* t
* e

Municipalities and communities of Washington County, Idaho, United States

County seat: Weiser

Cities|

* Cambridge
* Midvale
* Weiser

Map of Idaho highlighting Washington County

* Idaho portal
* United States portal

* v
* t
* e

State of Idaho

Boise (capital)

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44°27′N 116°47′W﻿ / ﻿44.45°N 116.78°W﻿ / 44.45; -116.78
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