The route travels between the town centers of Thompson, Connecticut and Webster, Massachusetts.

[1] In Massachusetts, the route runs along Lake Chaubunagungamaug (Webster Lake) just over the state line in the town of Webster, passing by the Hubbard Regional Hospital.

It intersects with Interstate 395 at Exit 1, passing by the eastern edge of the town center, and ends at the junction of Routes 12 and 16 in the East Village section of Webster.

Part of Route 193, between Route 12 and the intersection with East Thompson Road, used to be part of the Boston Turnpike, a toll road that operated from 1797 to approximately 1879.

[3] At the same time, Massachusetts numbered the continuation of the road from Connecticut as Route 193.