- Southern Terminus:
- Federal Road (US 202) in Brookfield
- Northern Terminus:
- New Milford Road East (CT 67) in Bridgewater
- Fairfield, Litchfield
CT 133 is an L-shaped route extending from Brookfield to Bridgewater. It begins at Federal Road (US 202) and runs east to the Housatonic River. There, it curves to the north and crosses a bridge over the river. It continues north to end at New Milford Road East (CT 67). The entire length is a two-lane undivided road.