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.