- Southern Terminus:
- Post Avenue (CR 4) in Westbury
- Northern Terminus:
- Jericho Turnpike (NY 25) in Jericho
- 2.52 miles
Nassau CR 63 runs diagonally from Westbury to Jericho. It begins as Union Avenue at Post Avenue (CR 4) and runs northeast to the western terminus of Prospect Avenue (CR 12). At this point, it changes name to become Brush Hollow Road. Brush Hollow Road continues northeast and runs under the northern terminus of the Wantagh Parkway. CR 63 ends at Jericho Turnpike (NY 25) near its interchange with the Long Island Expressway (I-495) in Jericho.