Route 57 is a secondary state highway in western Connecticut serving as the "Main Street" of and connecting the towns of Westport and Weston.

The road continues north through Redding to end at US 7 just after crossing into Wilton, in the neighborhood of Georgetown.

Route 57 then turns onto Weston Road as it intersects with the Merritt Parkway at an interchange (Exit 42).

Past Weston center, the road becomes Georgetown Road and proceeds for another four miles (6 km) through Weston until it reaches Route 107 just across the town line in Redding.

Route 57 then turns west along Route 107 (Redding Road and School Street), overlapping it for 0.3 mi (0.48 km) into the Georgetown village of the town of Wilton.