Whalley Avenue, Amity Road, New Haven Road, South Main Street, Cherry Street, Meadow Street, Church Street, North Church Street, Straits Turnpike, Main Street, Litchfield Road, Watertown Road, South Plains Road, South Street, North Street, Goshen Road, Old Middle Street, Hollenbeck Road, Huntsville-South Canaan Road

Southern Terminus:
Whalley Avenue (CT 10) and Fitch Street (CT 10) in New Haven
Northern Terminus:
South Canaan Road (US 7) in Canaan
52.57 miles
New Haven, Hartford, Litchfield

CT 63 is a north/south route extending from New Haven to Canaan in the northwest corner of the state. It begins at the point where CT 10 turns from Whalley Avenue onto Fitch Street. CT 63 follows Whalley Avenue until just before its interchange with the Wilbur Cross Parkway (CT 15). There, Whalley Avenue splits off to become CT 69, while CT 63 continues to the north as Amity Road. In Bethany, Amity Road curves to the west and becomes New Haven Road. Amity Road runs west toward Naugatuck, where it curves to the north and becomes South Main Street. At an interchange with the CT 8 expressway, CT 63 leaves South Main Street and turns west again, crossing a bridge over the Naugatuck River. On the other side, it merges into Cherry Street. CT 63 changes names a few times as it passes through Naugatuck from Cherry Street to Meadow Street to Church Street.

Heading out of town, CT 63 becomes Straits Turnpike. It passes west of Waterbury, having an interchange with the Yankee Expressway (I-84). Straits Turnpike ends at Main Street, which is designated CT 73 to the south. CT 63 follows Main Street through Watertown. Heading out of town, it becomes Litchfield Road. It continues north and northwest through Litchfield and Goshen to eventually reach Canaan, where it ends at South Canaan Road (US 7).

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