Long Beach is a city located in Harrison County, Mississippi, United States. It is part of the Gulfport-Biloxi metropolitan area. As of the 20…Long Beach is a city located in Harrison County, Mississippi, United States. It is part of the Gulfport-Biloxi metropolitan area. As of the 2020 census, the city had a population of 15,829. According to the United States Census Bureau, the city has a total area of 10.4 square miles, of which 0.39 square miles, or 3.74% is covered by water.
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