THE HARRISON COUNTY LAND BRIEF
Land in the
Southern Pine Plains and Hills setting.
Harrison County has 573.7 square miles of land in Mississippi. 3 mapped landscape regions meet across Harrison County: Southern Pine Plains and Hills, Gulf Coast Flatwoods, Gulf Barrier Islands and Coastal Marshes.
Irregular plains of sand, silt and clay support a mix of pine and hardwood landscapes. The region has more relief than the lower coastal plain, with generally gentle stream gradients.
Regional context: Southeastern Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Harrison County intersects 3 mapped regional units. The largest mapped shares are:
- Southern Pine Plains and Hills64.9%
- Gulf Coast Flatwoods23%
- Gulf Barrier Islands and Coastal Marshes12%
Southern Coastal Plain in Harrison County
Low plains mingle with barrier islands, lagoons, marshes and inland lake districts. Coastal and inland settings vary substantially within this warm southeastern landscape.
Read the regional source ↗Finding your parcel within Harrison County
The atlas lists 9 cities, towns, townships, and Census communities associated with Harrison County, including Gulfport, Biloxi, D'Iberville. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Harrison County by land and water
The Census records 411 square miles of water within Harrison County, or 41.7% of its total area. That share is close to Harrison County’s 41.7%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Harrison County has 10.3 times the land area of nearby Gulfport city (55.6 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Hancock County, Jackson County, Pearl River County, Stone County within Mississippi. A tract near one of these lines should be matched to the county identifier on its own records.

