lies within Suffolk County. Initial designations Montauk Highway and Merrick Road were designated as NY 27 from the New York City line to Amagansett in the mid-1920s. From East Patchogue to Brookhaven, NY 27 followed South Country Road instead, which was part of Montauk Highway at the time. The NY 27 designation was extended eastward along Montauk Highway to Montauk Point by 1930. On February 24, 1930, South Country Road was added to the Suffolk County highway system as CR 36. NY 27 and Montauk Highway were realigned to directly connect East Patchogue and Brookhaven via North Bellport. NY 27 was realigned west of Oakdale to follow Sunrise Boulevard (the predecessor to Sunrise Highway), a new, parallel highway to Merrick Road and Montauk Highway between the New York City line and Massapequa and several local roads from Massapequa to Montauk Highway at Oakdale. The former routing of NY 27 on Montauk Highway from Massapequa to Oakdale became NY 27A, which connected to NY 27 in Massapequa by way of County Line Road. NY 27A was extended eastward along Montauk Highway to Patchogue in the early 1950s after NY 27 was realigned to follow a new highway between Oakdale and Patchogue. A limited-access highway extension of NY 27 to Shirley opened to traffic in the late 1950s, at which time NY 27A was extended eastward along NY 27's former routing to meet NY 27 in Shirley. Construction on a new alignment for NY 27 between NY 24 in Hampton Bays and Montauk Highway near Water Mill began by 1961 and was completed . The section of Montauk Highway between the two locations became part of NY 27A, even though it did not connect to any other part of the route. An extension of the Patchogue–Shirley limited-access highway to the vicinity of Eastport was completed as a realignment of NY 27 by 1964, allowing NY 27A to be extended once more along Montauk Highway. NY 27A was also extended east to Hampton Bays at this time, connecting to the segment of NY 27A between Hampton Bays and Water Mill and creating an overlap with NY 27. Maintenance transfers Ownership and maintenance of Montauk Highway between Oakdale and the town of Southampton was gradually transferred from the state of New York to Suffolk County during the 1960s and 1970s. The portion from the Patchogue village line east to NY 24 in Hampton Bays