County Route 17 is a county road located in western Suffolk County. The route runs south-to-north from NY 27A in East Islip to NY 111 in Hauppauge, just south of exit 56 on I-495 (the Long Island Expressway). Originally, CR 17 was an alignment of NY 111 (designated as State Highway 1208 internally). On September 13, 1966, the alignment was transferred from the state to Suffolk County and redesignated CR 17. The exit with the Heckscher State Parkway was added in the early 1990s.
