Montauk Highway is an east–west road extending for across the southern shore of
Long Island in
Suffolk County, New York, in the United States. It extends from the
Nassau County line in
Amityville, where it connects to
Merrick Road, to
Montauk Point State Park at the very eastern end of Long Island in
Montauk. The highway is known by several designations along its routing, primarily New York State Route 27A (NY 27A) from the county line to
Oakdale and
NY 27 east of
Southampton. The portion of Montauk Highway between Oakdale and Southampton is mostly county-maintained as
County Route 80 and
County Route 85 (CR 80 and CR 85, respectively).