- Western Terminus:
- South Street (CT 63) in Litchfield
- Eastern Terminus:
- Litchfield Road (CT 4) and Birge Park Road (CT 4) in Harwinton
- 7.48 miles
CT 118 is a short east/west route in Litchfield County. It begins at South Street (CT 63) just south of where it crosses East Street (US 202) in Litchfield and runs east to Harwinton, where it ends at CT 4. CT 222 and CT 254, the two routes heading north out of Thomaston, both have their northern termini at CT 118. There is also an interchange with the CT 8 expressway along the way.