Sea Isle City is a city in Cape May County, in the U.S. state of New Jersey. The city, and all of Cape May County, is part of the South Jersey regi…Sea Isle City is a city in Cape May County, in the U.S. state of New Jersey. The city, and all of Cape May County, is part of the South Jersey region of the state and of the Ocean City metropolitan statistical area, and is part of the Philadelphia-Wilmington-Camden, PA-NJ-DE-MD combined statistical area, also known as the Delaware Valley or Philadelphia metropolitan area. As of the 2020 United States census, the city's year-round population was 2,104, a decrease of 10 from the 2010 census count of 2,114, which in turn reflected a decline of 721 from the 2,835 counted in the 2000 census. Visitors raise the population to as much as 40,000 during the peak summer season from Memorial Day to Labor Day. Sea Isle City is located on Ludlam Island, which also contains the Strathmere section of Upper Township.
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