New Mexico State Road 373

State Road 373 (NM 373), also known as West Union Avenue, is a 1.496 mi state highway on the southern border of Mesilla in Doña Ana County, New Mexico, United States, that connects New Mexico State Road 372 (NM 372) with the southern end of McDowell Road.

History
NM 373 was truncated to its current eastern terminus on November 2, 1992 in a road exchange agreement with the city of Mesilla.