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 from the 42,940 counted in the 2000 Census, which had in turn increased by 10,431 from the 32,509 counted in the 1990 Census. As of the 2016 Population Estimates Program census estimate, the township's population was 44,999.Bridgewater Township was originally created by Royal charter on April 4, 1749, from portions of the Northern precinct. It was incorporated as one of New Jersey's initial group of 104 townships by the New Jersey Legislature on February 21, 1798, under the Township Act of 1798. During the nineteenth century, portions of the township were taken to form Warren Township, Branchburg Township, Somerville, Raritan and Bound Brook.