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). 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assigned to the road have also changed over time: Montauk Highway was the original route of NY 27 until most of it was superseded in purpose by Sunrise Highway, and for a brief time all of Montauk Highway west of Southampton was signed as NY 27A.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. Route description Montauk Highway begins at the Nassau–Suffolk county line, where it connects to Merrick Road. It heads east along the southern shore of Long Island, carrying NY 27A from Amityville to Oakdale. The highway generally narrows to two lanes in most places, especially through communities of which it forms the main street, such as Amityville, the village of Babylon, West Islip, Bay Shore, the hamlet of Islip, East Islip, Great River, Oakdale, Sayville, Patchogue, and Center Moriches. In these places, Montauk Highway is often called Main Street. In addition to being called Montauk Highway and Main Street in Suffolk County, it is also historically known as South Country Road, a name that is only used by former segments today. NY 27A ends at NY 27 exit 46A in Oakdale, giving way to CR 85 along Montauk Highway. As CR 85, Montauk Highway runs through the hamlets of Oakdale, West Sayville, Sayville, Bayport, and Blue Point to the village of Patchogue, where the designation ends