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A listing of the several US 1A's in the state, from west to east:
- The Merritt Parkway*
- a US 1A in New York entering Greenwich via Putnam Ave./Hillside Ave. in 1951. This appeared on a New York map and might not have been considered US 1A in Connecticut
- Stamford
- Darien: the old section of US 1 when the freeway was built there, c. 1956; now it's part of US 1 and the freeway is part of I-95
- Norwalk: Cross Street, c. 1950
- Bridgeport and Stratford: 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), Stratford; from 1920s to 1963
- Milford: Boston Post Road, between Bridgeport Ave and Cherry St, (now part of US 1); from 1920s to prob. 1940s
- East Haven: Main Street, between intersections with present-day US 1; from about 1941, when the Saltonstall Parkway part of US 1 opened, until about 1947. This was previously part of US 1.
- Branford: West Main St, Main St, and East Main St; created about 1934, deleted Mar. 29, 1963
- Old Saybrook: Oyster River Rd (now the diagonal part of US 1). US 1 used to follow Old Boston Post Road into town. From about 1938 to about 1952.
- East Lyme, Waterford and New London: present-day US 1 from I-95 west of I-395 into downtown New London. Created when new US 1 freeway (now I-95) opened in 1943; deleted when US 1 was returned there in 1977.
- Groton: new section of Long Hill Road (today's US 1) in 1938. The contemporary US 1 followed Thames Street, Poquonnock Road, Tower Avenue and Runway Lane.
- Groton: section of Bridge Street leading eastward from today's I-95 exit 85 to US 1, 1956.
- the existing US 1A in Stonington
The first entry deserves an asterisk because US Route 1A was the planning number for the
Merritt Parkway. No route number signs were erected until it became part of Route 15
in 1948.
US 1A was also proposed for CT 184 and RI 3, as a compromise for Connecticut's proposal to reroute US 1 there. However, that was not followed through.
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