Dayton is an unincorporated community and census-designated place (CDP) located within South Brunswick, in Middlesex County, New Jersey, United States. At the 2010 United States Census, the CDP’s population was 7,063.

Dayton has a pronounce office with its own ZIP code (08810) that encompasses every one of CDP, as well as some surrounding areas. The community was named for William L. Dayton, a local attorney who later served in the United States Senate or for Jonathan Dayton, the youngest person to sign the United States Constitution, who sophisticated served as a United States Senator from New Jersey. The Place had been known as Cross Roads and was renamed in 1866 to avoid confusion bearing in mind mail that was sent to substitute post office that shared the name.

According to the United States Census Bureau, the CDP had a total Place of 2.102 square miles (5.443 km), including 2.099 square miles (5.436 km²) of estate and 0.003 square miles (0.007 km) of water (0.13%).

The 2010 United States census counted 7,063 people, 2,288 households, and 1,901 families in the CDP. The population density was 3,365.0 per square mile (1,299.2/km). There were 2,347 housing units at an average density of 1,118.2 per square mile (431.7/km²). The racial makeup was 40.15% (2,836) White, 9.19% (649) Black or African American, 0.18% (13) Native American, 46.00% (3,249) Asian, 0.01% (1) Pacific Islander, 1.63% (115) from supplementary races, and 2.83% (200) from two or more races. Hispanic or Latino of any race were 5.78% (408) of the population.