South Seaville is an unincorporated community located within Dennis Township in Cape May County, in the U.S. state of New Jersey. South Seaville is northwest of Sea Isle City. South Seaville has a post office with ZIP Code 08246.
As of the 2020 census, South Seaville had a population of 695.
A post office was established in 1867, with Remington Corson as the first postmaster.
South Seaville was first listed as a census designated place in the 2020 U.S. census.
As with other parts of Dennis Township, the area is zoned to Dennis Township Public Schools (for grades K-8) and Middle Township Public Schools (for high school). The latter operates Middle Township High School.
Countywide schools include Cape May County Technical High School and Cape May County Special Services School District.