New York State Route 120A (NY 120A) is a state highway in southern Westchester County, New York, in the United States. It serves as an alternate route to the southern half of NY 120 running along the New York–Connecticut state line. The southern terminus of the route is at NY 120 in Harrison. Its northern terminus is at NY 120 in North Castle. Most of the route straddles the New York–Connecticut state line, and part of the route is physically located in Connecticut. However, this part of the highway is not recognized by Connecticut as "Route 120A", and is considered to be part of NY 120A by the New York State Department of Transportation (NYSDOT). Route description NY 120A begins at an intersection with NY 120 next to I-287 (the Cross-Westchester Expressway) in the village of Harrison. Although the route is signed north–south, it initially heads east along Westchester Avenue. East of the freeway overpass, NY 120 leaves to the northwest while NY 120A continues eastward on the four-lane Westchester Avenue. It serves residential areas until it crosses into Rye Brook, where the street makes a turn to the southeast and soon enters more commercialized neighborhoods. In the center of Rye Brook, the route meets Ridge Street (unsigned County Route 54 or CR 54). The businesses give way to homes east of the junction, and NY 120A passes into the village of Port Chester just three blocks from Ridge Street near an intersection with Bowman Avenue (CR 104). Inside the village limits, maintenance of NY 120A shifts from the state to Westchester County, which inventories the route as CR 112. Continuing on, the road narrows to two lanes ahead of Port Chester's central business district, where NY 120A passes the Port Chester Public Library and the village's post office ahead of a junction with Pearl Street three blocks west of U.S. Route 1 and two blocks west of the Metro-North Railroad. Here, NY 120A turns off Westchester Avenue and onto North Pearl Street, becoming a village-maintained route in the process. The route's northeastward run on North Pearl Street is brief, however, as NY 120A turns northwest onto King Street after just two blocks. As the route heads away from Pearl Street and Port Chester's commercial center, the blocks of businesses are gradually replaced with the residential neighborhoods that comprise most of northern Port Chester. About north of Pearl Street, NY