- Southern Terminus:
- New York-Connecticut state line
- Northern Terminus:
- Connecticut-Rhode Island state line
- 117.37 miles
- Fairfield, New Haven, Middlesex, New London
US 1 is a major route running from Key West in Florida to the Canadian border in Maine. Prior to the construction of I-95, it was the main route along the East Coast. The entire length of US 1 is marked as a north/south route, although in Connecticut it runs east and west. The entire length of the Connecticut section of US 1 is a local road with traffic lights. It runs through the southern section of the state, passing through the same areas as the Connecticut Turnpike (I-95), which it crosses many times. US 1 takes on a large number of names throughout its length in Connecticut.