
Harrison County
- State:
- Mississippi
- County Seat:
- Biloxi and Gulfport
Harrison County's estimated 2025 population is 210,950 with a growth rate of 0.08% in the past year according to the most recent United States census data. Harrison County is the 1st largest county in Mississippi. The 2010 population was 187,868 and has seen a growth of 12.29% since that time.