Seaside Heights is a borough situated on the Jersey Shore, within Ocean County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 2,440, a decrease of 447 (−15.5%) from the 2010 census count of 2,887, which in turn had reflected a decline of 268 (−8.5%) from the 3,155 counted in the 2000 census. Seaside Heights is located on the Barnegat Peninsula, a long, narrow barrier peninsula that separates Barnegat Bay from the Atlantic Ocean. During the summer, the borough attracts a crowd largely under the age of 21, drawn to a community with boardwalk entertainment and one of the few shore communities with sizable numbers of apartments, attracting as many as 65,000 people who are often out until early morning visiting bars and restaurants.

Ocean County is a county located along the Jersey Shore in the south-central portion of the U.S. state of New Jersey, and the southernmost county in the New York metropolitan area. The county borders the Atlantic Ocean on the east and in terms of total area is the state's largest county. Its county seat is Toms River. The county is considered part of the Central Jersey region of the state, though it was not among the four counties explicitly listed as included in Central Jersey as part of legislation signed into law in 2023.