Gulfport is a port city in Harrison County, Mississippi, United States, and its co-county seat. It had a population of 72,926 at the 2020 census, making it the second-most populous city in Mississippi after Jackson. The Gulfport–Biloxi metropolitan area had a population of 416,259. Gulfport lies along the Gulf Coast of the United States in southern Mississippi, taking its name from its port on the Gulf Coast on the Mississippi Sound.