Montauk Highway | |
|---|---|
 Map of eastern Long Island with the Montauk Highway in red (Section maintained as NY 900W backed in blue) | |
| Route information | |
| Maintained by NYSDOT, Suffolk County DPW, and the villages of Patchogue and Southampton | |
| Length | 94.52 mi[1][2][3] (152.12 km) |
| Component highways |  NY 27A from Amityville to Great River CR 85 from Great River to Patchogue CR 80 from Patchogue to Shinnecock Hills NY 27 from Southampton to Montauk Point |
| Major junctions | |
| West end | Nassau County line in Amityville |
 NY 110 in Amityville NY 231 in Babylon Robert Moses Causeway in West Islip NY 111 in Islip Heckscher State Parkway in Great River NY 27 in Great River CR 97 in Bayport NY 112 in Patchogue NY 24 in Hampton Bays NY 114 in East Hampton | |
| East end | Montauk Point State Park in Montauk |
| Location | |
| Country | United States |
| State | New York |
| County | Suffolk |
| Highway system | |
Montauk Highway is an east–west road extending for 95 miles (153 km) 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).
The highway was one of the original through highways of Long Island, initially extending from Jamaica in the New York City borough of Queens to Montauk Point. Within Queens, the road is now known as Merrick Boulevard, and for its entire run in Nassau County, the road is Merrick Road, with the Montauk Highway designation picking up in Amityville. The designations assigned to the road have also changed over time: Montauk Highway was the original route of NY 27 until most of it was superseded in purpose by Sunrise Highway, and for a brief time all of Montauk Highway west of Southampton was signed as NY 27A. It is still the southernmost through route on Long Island, although it has been realigned in several locations.