Margate City is a city situated on the Jersey Shore on Absecon Island, within Atlantic County, in the U.S. state of New Jersey, on the Atlantic Ocean shoreline. As of the 2020 United States census, the city's population was 5,317, a decrease of 1,037 from the 2010 census count of 6,354, which in turn had reflected a decline of 1,839 from the 8,193 counted in the 2000 census. Geographically, the city, and all of Atlantic County, is part of the South Jersey region of the state and of the Atlantic City-Hammonton metropolitan statistical area, which in turn is included in the Philadelphia-Reading-Camden combined statistical area and the Delaware Valley.