Bridgewater Township is a township in Somerset County, New Jersey, United States. As of the 2010 United States Census, the township's population was 44,464, reflecting an increase of 1,524 (+3.5%) from the 42,940 counted in the 2000 Census, which had in turn increased by 10,431 (+32.1%) from the 32,509 counted in the 1990 Census.