New York State Route 111 (NY 111) is a state highway located in Suffolk County, New York, in the United States. It runs north–south for through the towns of Islip and Smithtown, connecting NY 27A in the town seat of Islip to the east end of the NY 25 and NY 25A concurrency in Smithtown's Village of the Branch. Most of the road is a two-lane highway, save for several short four-lane stretches in the vicinity of interchanges along the route. NY 111 was assigned as part of the 1930 renumbering of state highways in New York as an East Islip–Village of the Branch highway, using what is now County Route 17 (CR 17) south of Hauppauge. It was realigned to serve the hamlet of Islip in 1966. Route description NY 111 begins at an intersection with NY 27A (Main Street) in the town of Islip. The route proceeds north through the hamlet of Islip along the two-lane Islip Avenue, passing through a short residential stretch ahead of an intersection with CR 50 (Union Boulevard). NY 111 soon crosses the nearby Montauk Branch of the Long Island Rail Road just east of the Islip station, from where it continues north past various businesses and residences. As the road heads northward, it intersects with Bittermint Street, a connector to NY 27 (Sunrise Highway) eastbound. After crossing over NY 27, the route intersects with a ramp serving the westbound lanes and Islip Boulevard, which connects NY 27 westbound to NY 111. Past Sunrise Highway, the route serves many blocks of residences prior to entering a cloverleaf interchange with the Heckscher State Parkway (exit 43). After this junction, NY 111 continues north as a two-lane residential street to the hamlet of Central Islip. Here, the residences give way to various businesses as NY 111 and Islip Avenue briefly bend to the northwest for several blocks. Another north-northwesterly stretch follows, bringing the highway over another Long Island Rail Road line, this time the Ronkonkoma Branch. Past the railroad overpass, NY 111 intersects with CR 100 (Suffolk Avenue), at which point NY 111 leaves Islip Avenue and changes names to Joshua's Path. One block north of CR 100, Caleb's Path forks off to the northwest while NY 111 splits to the northeast along Joshua's Path, serving a long stretch of homes in the northern part of Central Islip. Several blocks to the north, NY 111