Sayreville is a borough located on the Raritan River, near Raritan Bay in Middlesex County, New Jersey. As of the 2000 United States Census, the borough population was 40,377.
Sayreville was originally incorporated as a township on April 6, 1876, from portions of South Amboy Township. On April 2, 1919, the borough was reincorporated as the Borough of Sayreville, based on the results of a referendum held on April 29, 1919.
Sayreville is located at 40°27′57″N 74°19′27″W / 40.465769°N 74.324043°W / 40.465769; -74.324043 (40.465769, -74.324043).