Gulfport is a city on the Mississippi Sound of the Gulf Coast, adjacent to Biloxi, Mississippi. With a population of 72,926 as of the 2020 census…Gulfport is a city on the Mississippi Sound of the Gulf Coast, adjacent to Biloxi, Mississippi. With a population of 72,926 as of the 2020 census, it is the second-most populous city in Mississippi and the largest in Harrison County, of which it is a co-county seat. Gulfport anchors the Gulfport-Biloxi metropolitan area, which has a population of 416,259. It is known for its white sand beaches, deep-water port facilities, association with the United States military, and its development as a coastal tourism destination.