Middlefield Road, Durham Road, Main Street, Baileyville Road
- Southern Terminus:
- Main Street (CT 17) in Durham
- Northern Terminus:
- Meriden Road (CT 66) in Middlefield
- 5.09 miles
CT 147 is a short diagonal route running northwest from Main Street (CT 17) in Durham through Middlefield to end at Meriden Road (CT 66). It ends at the westernmost traffic light on CT 66 before it becomes an expressway.