Bayville is an unincorporated community located within Berkeley Township in Ocean County, New Jersey, United States. The area is served as United States Postal Service ZIP Code 08721. As of the 2010 United States Census, the population for ZIP Code Tabulation Area (ZCTA) 08721 was 20,512. Central Regional High School is the local high school for the area.

Berkeley Township is a township in Ocean County, in the U.S. state of New Jersey, extending from the Jersey Shore westward into the New Jersey Pine Barrens. As of the 2020 United States census, the township's population was 43,754, the highest ever in any decennial count and an increase of 2,499 (+6.1%) from the 2010 census count of 41,255, which in turn reflected an increase of 1,264 (+3.2%) from the 39,991 counted in the 2000 census.