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() is a city in Harrison County, Mississippi, in the United States. The 2000 census recorded the population as 50,644. Along with Gulfport, Biloxi is a county seat of Harrison County.
The city is part of the Gulfport-Biloxi metropolitan area and the Gulfport-Biloxi-Pascagoula, Mississippi Combined Statistical Area. Pre-Katrina, Biloxi was the third largest city in Mississippi; but with its population losses following that storm, Hattiesburg now has that distinction.
The beachfront of Biloxi lies directly on the Mississippi Sound, with barrier islands scattered off the coast and into the Gulf of Mexico.
Keesler Air Force Base lies within the city and is home to the 81st Training Wing and the 403rd Reserve Wing of the U.S. Air Force.
According to the United States Census Bureau, the city has a total area of 46.5 mi²(120.5 km² ). 38.0 mi² (98.5 km²) of it is land and 8.5 mi² (22.0 km²) of it is water. The total area is 18.27% water.