Dayton is a census-designated place and unincorporated area located within South Brunswick Township, in Middlesex County, New Jersey. As of the United States 2000 Census, the CDP population was 6,235. Dayton is also a post office with its own ZIP code (08810). The ZIP code encompasses the entire CDP, as well as some surrounding area. Dayton is located at 40°22′50″N 74°31′3″W / 40.38056°N 74.5175°W / 40.38056; -74.5175 (40.380462, -74.517472).