# List of U.S. Highways in Connecticut

United States Numbered Highways in the U.S. state of Connecticut, are numbered by the American Association of State Highway and Transportation Officials (AASHTO) and maintained by the Connecticut Department of Transportation, a total of 547.75 miles (881.52 km) as a system of state highways and are numbered from 1 to 202.

## History

In 1926, the U.S. highway system was implemented. U.S. Routes 1, 5, 6, and 7, plus 202 were used as designations on several primary state highways, replacing New England routes 1, 2, 3, and 4, respectively. The other New England routes that were not re-designated as U.S. routes became ordinary state highways but kept their number designation, which are used even today (with some realignment).

## Primary routes

| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| US 1 | 117.37 | 188.89 | US 1 in Port Chester, NY | US 1 in Westerly, RI | 01926-01-011926 | current | Mostly follows the old New England Route 1; functionally bypassed by I-95 |
| US 5 | 54.59 | 87.85 | I-91 in New Haven, CT | US 5 in Longmeadow, MA | 01926-01-011926 | current | Mostly follows the old New England Route 2; functionally bypassed by I-91 |
| US 6 | 116.33 | 187.21 | US 6/US 202 in Southeast, NY | US 6 in Foster, RI | 01926-01-011926 | current | Most of the proposed routing was part of old New England Route 3 |
| US 7 | 78.29 | 126.00 | I-95 in Norwalk | US 7 in Sheffield, MA | 01926-01-011926 | current | Mostly follows the old New England Route 4 |
| US 44 | 106.03 | 170.64 | US 44 in North East, NY | US 44 in Glocester, RI | 01934-01-011934 | current | |
| US 202 | 75.14 | 120.93 | US 6/US 202 in Southeast, NY | US 202/Route 10 in Southwick, MA | 01935-01-011935 | current | |
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## Alternate and auxiliary routes

| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| US 1A | 1.93 | 3.11 | US 1 in Stonington | US 1 in Stonington | 01939-01-011939 | current | Only remaining US alternate route in the state |
| US 1A | — | — | Greenwich | Milford | — | — | Planning number for the Merritt Parkway. No route number signs were erected until it became part of Route 15 in 1948. |
| US 1A | — | — | Stamford | Stamford | — | — | |
| US 1A | — | — | Darien | Darien | 01956-01-011956 | — | Old section of US 1 when the freeway was built there; now part of US 1 and the freeway is part of I-95 |
| US 1A | — | — | Norwalk | Norwalk | 01950-01-01c. 1950 | — | Cross Street |
| US 1A | — | — | Bridgeport | Stratford | 01928-01-01c. 1928 | 01963-01-011963 | Present-day US 1 (North St, Boston Rd, Barnum Ave) then Main St (part of today's Route 113) and E. Main St (part of today's Route 110) |
| US 1A | — | — | Milford | Milford | 01920-01-01c. 1920 | 01940-01-01c. 1940 | Boston Post Road, between Bridgeport Ave and Cherry St; now part of US 1 |
| US 1A | — | — | East Haven | East Haven | 01941-01-01c. 1941 | 01947-01-01c. 1947 | Main Street when the Saltonstall Parkway part of US 1 opened; previously part of US 1. |
| US 1A | — | — | Branford, Connecticut | Branford, Connecticut | 01934-01-01c. 1934 | 01963-01-011963 | West Main St, Main St, and East Main St |
| US 1A | — | — | Old Saybrook | Old Saybrook | 01938-01-01c. 1938 | 01952-01-01c. 1952 | Oyster River Rd (now the diagonal part of US 1). US 1 used to follow Old Boston Post Road into town. |
| US 1A | — | — | East Lyme | New London | 01943-01-011943 | 01977-01-011977 | Created when new US 1 freeway (now I-95) opened in 1943; deleted when US 1 was returned there in 1977. |
| US 1A | — | — | Groton | Groton | 01936-01-011936 | 01940-01-011940 | New section of Long Hill Road (today's US 1). The contemporary US 1 followed Thames Street, Poquonnock Road, Tower Avenue and Runway Lane. |
| US 1A | — | — | Groton | Groton | 01956-01-01c. 1956 | — | Section of Bridge Street leading eastward from today's I-95 exit 85 to US 1 |
| US 5A | — | — | Berlin Turnpike in Wethersfield | MA 159 in Suffield | 01932-01-011932 | 01968-01-011968 | Now Route 159 |
| US 5A | — | — | East Hartford | Windsor | 01940-01-011940 | 01945-01-011945 | Originally US 5 before the four-lane US 5 opened to the east. |
| US 5A | — | — | Berlin | Berlin | 01940-01-011940 | 01963-01-011963 | Worthington Ridge Road, formerly part of US 5. |
| US 5A | — | — | Meriden | Wallingford | 01932-01-011932 | 01963-01-011963 | A 7-mile section including Old Colony Road. |
| US 5A | — | — | New Haven | New Haven | 01932-01-011932 | 01940-01-011940 | State Street south from today's Route 22; now part of US 5 |
| US 5A | — | — | New Haven | North Haven | 01950-01-01c. 1950 | 01966-01-011966 | Middletown Avenue (today's Route 17) and Maple Avenue (today's Route 103); early US 5 |
| US 6A | — | — | Newton | Southbury | 01955-01-011955 | 01965-01-011965 | US 6A was created when a new US 6/US 202 highway opened to the south (which is now part of I-84). |
| US 6A | — | — | Plymouth | Hartford | 01932-01-011932 | 01942-01-011942 | There have been several routes signed as US 6A in the state; no special routes currently exist. |
| US 6A | — | — | Woodbury | Willimantic | 01941-01-011941 | 01967-01-011967 | Also served Waterbury, Meriden and Middletown; in 1967, US 6A was broken into Routes 64, 322, and 66 |
| US 6A | — | — | Coventry | Windham | 01940-01-011940 | 01942-01-011942 | When US 6 was moved to its current "Suicide 6" path, this route briefly was US 6A before becoming part of Route 31. |
| US 6A | — | — | Killingly | Killingly | 01959-01-011959 | 01968-01-011968 | Now the Danielson Pike (SR 607/SR 618), this northern loop out of Danielson was part of US 6 |
| US 44A | 22.43 | 36.10 | US 44 in Manchester | US 44 in Ashford | 01948-01-011948 | 01982-01-011982 | When US 44 was relocated along a portion of the Wilbur Cross Highway, the former surface alignment became US 44A. |
| US 202A | 1.23 | 1.98 | US 202 in Danbury | US 202 in Danbury | 01935-01-011935 | 01974-01-011974 | Former number for Coal Pit Hill Road in Danbury |
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