List of Interstate Highways in Connecticut

Dwight D. Eisenhower National System of Interstate and Defense Highways
Standard Interstate Highway signs in Connecticut
All Interstate Highways in Connecticut
System information
Length	446.33 mi (718.30 km)
Notes	Interstate Highways in Connecticut maintained by ConnDOT
Highway names
Interstates	Interstate X (I-X)
US Highways	U.S. Route X (US X)
State	Route X
System links
Connecticut State Highway System Interstate US State SSR SR Scenic

Interstate Highways in the U.S. state of Connecticut run a total of 446.33 miles (718.30 km). Connecticut has three primary highways and five auxiliary highways. Most of the highways are maintained by the Connecticut Department of Transportation, with the exception of Interstate 684, which is maintained by the New York State Department of Transportation.^[1]

In 1957, Connecticut received approval for the routes of its three primary Interstate highways: I-84, I-91, and I-95. This plan was extended in 1959 to include I-291 and I-491. The first Interstate Highway signs were installed on a completed section of I-91 north of Hartford in 1961. The primary interstates were all completed by 1969 after the last section of I-84 opened between Farmington and Plainville. The rest of the highways were built or renumbered to their current designations by 1994 when a five-mile section of I-291 opened 35 years behind schedule. Connecticut was one of the last states in the US to raise its maximum speed limit above the former federally mandated limit of 55 mph (89 km/h). The state raised its maximum to 65 mph (105 km/h) in 1998.^[2]

Though parts of the Interstate Highway System in Connecticut were previously tolled, all tolls were removed from Connecticut's highways by 1988.^[2][3]

Number	Length (mi)[1]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-82	—	—	I-84 in East Hartford	Rhode Island state line east of Killingly	01956-01-011956	01968-01-011968	Early designation for the extension of I-84 from East Hartford to Providence. Re-designated as I-84 in 1968. Completed sections around Manchester and Willimantic re-designated as I-384 and US-6, respectively, in 1984 when East Hartford-Providence I-84 extension was cancelled.
I-84	97.90	157.55	I-84 at the New York state line	I-84 at the Massachusetts state line	01969-01-011969	current	Eastward extension from Manchester to Rhode Island cancelled; completed section around Manchester renumbered as I-384. Windham Bypass section re-designated as US-6. I-84 realigned to follow former I-86/CT-15 routing (Wilbur Cross Highway) to I-90 in Massachusetts.
I-84 BL	4.1	6.6	I-84 in Hawleyville	I-84 in Sandy Hook	01960-01-011960	01979-01-011979	ran from what is today between Exits 9 & 10 along CT 25 and US 6
I-86	31.27	50.32	I-84 in East Hartford	I-86 at the Massachusetts state line	01971-01-011971	01984-01-011984	Renumbered I-84 and Route 3
I-87	1.41	2.27	I-87 at the New York state line near Greenwich	I-87 at the New York state line near Armonk, New York	01961-01-011961	01968-01-011968	Renumbered I-684
I-89	—	—	I-95/Connecticut Turnpike in Norwalk	I-89 at the Massachusetts state line north of North Canaan	01956-01-011956	01970-11-231970	Proposed, but never completed, interstate route paralleling US-7 from Norwalk, CT to Canadian Border north of Burlington, VT. Completed freeway sections in Connecticut (through Norwalk, Danbury, and around Brookfield) designated as US-7.
I-91	58.00	93.34	I-95 in New Haven	I-91 at the Massachusetts state line	01959-01-011959	current
I-95	111.57	179.55	I-95 at the New York state line	I-95 at the Rhode Island state line	01964-01-011964	current	Part of the Connecticut Turnpike from the New York state line at Greenwich to Waterford.
I-284	—	—	I-84 in East Hartford	I-291 in South Windsor	01976-01-011976	01983-01-011983	Unbuilt due to environmental concerns, except of a short freeway stub that serve as ramps from I-84 to Governor Street.
I-291	6.40	10.30	I-91 in Windsor	I-84 in Manchester	01994-01-011994	current	Partially completed Hartford Beltway (northeast quadrant). Northwest quadrant cancelled; southwest quadrant of I-291 completed as an extension of the Route 9 freeway between I-91 in Berlin to I-84 in Farmington.
I-384	8.53	13.73	I-84 / US 6 in East Hartford	US 6 / US 44 in Bolton	01984-01-011984	current	Designated as I-84 from its opening in 1971 to 1984.
I-395	54.69	88.02	I-95 in East Lyme	I-395 at the Massachusetts state line	01968-01-011968	current	Part of the Connecticut Turnpike from Waterford to Killingly; formerly designated as Route 52, and proposed as an extension to I-290. First highway (in 2015) in Connecticut and only CT interstate (as of 2017) to receive mile-based exits
I-484	—	—	I-84 in Hartford	I-91 in Hartford	01968-01-011968	01983-01-011983	Became the Conlin–Whitehead Highway and unsigned SR 598
I-491	—	—	I-91 in Wethersfield	I-84 in East Hartford	01958-01-011958	01973-01-011973	Parts co-signed with I-86; re-designated as Route 3
I-684	1.41	2.27	I-684 at the New York state line	I-684 at the New York state line	01968-01-011968	current	No intersections with other roads in Connecticut; previously designated as I-87
I-691	8.92	14.36	I-84 at Southington–Cheshire	I-91 at Meriden	01976-01-011976	current	Formerly designated as US-6A, then Route 66;
Former

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• U.S. Roads portal
• Connecticut Turnpike

Wikimedia Commons has media related to Interstate Highways in Connecticut.

• Connecticut Department of Transportation
• Connecticut Roads from Kurumi