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 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 the Barnegat Bay from the Atlantic Ocean. During the summer, the borough attracts a crowd largely under the age of 21, mainly highschoolers and young adults, 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.