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is a Township in Mercer County, New Jersey, in the United States. As of the 2000 census, the township population was 21,907.
Princeton Junction is a census-designated place and unincorporated area located within West Windsor Township.
According to the United States Census Bureau, the township has a total area of 26.3 square miles (68.2 km²), of which, 26.0 square miles (67.4 km²) of it is land and 0.3 square miles (0.8 km²) of it (1.22%) is water.
West Windsor Township borders Princeton Township, Lawrence Township, Hamilton Township, Robbinsville Township, East Windsor Township, and Plainsboro Township in Middlesex County.