Long Beach is a city in Nassau County, New York on a barrier island off the South Shore of Long Island and one of only two cities on the island. As of the United States 2000 Census, the city population was 35,462. It was incorporated in 1922, and is nicknamed The City By the Sea. Long Beach apartments for rent comparison page shows most up to date rent information on Long Beach apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.