Seaville is an unincorporated community and census-designated place located within Upper Township in Cape May County, in the U.S. state of New Jersey. A post office was established in 1849, with Remington Corson as the first postmaster. Seaville is home to the only yellow fire trucks in Cape May County, a tradition started in 1985 when the Seaville Fire Rescue Company was purchasing a new vehicle and thought that federal regulations would require the color.