County highway
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.