Seaville is an unincorporated community and census-designated place (CDP) located within Upper Township in Cape May County, in the U.S. state of New Jersey. As of the 2020 census, Seaville had a population of 2,426.
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. Since being formed in 1964 and purchasing its first fire truck a year later, the Seaville company has served the area, responding to over 200 calls a year from its fire station which is located on Route 50 across from Dino's Seaville Diner.
Seaville was first listed as a census designated place in the 2020 U.S. census.
As with other parts of Upper Township, the area is zoned to Upper Township School District (for grades K-8) and Ocean City School District (for high school). The latter operates Ocean City High School.
Countywide schools include Cape May County Technical High School and Cape May County Special Services School District.