Founded in 1841, Harrison County is one of 82 counties in the state of Mississippi. Historically, Harrison County was formed from Hancock County. The city of Gulfport, Biloxi is the county seat. With FIPS code of 47, Harrison County has a population of 209,396 and area of 581 square miles (1,505 km2).
List of all cities in Harrison County, MS alphabetically
| City/Town | Postal Code | Area Code |
| Airey, MS | 39574 | 228 |
| Biloxi, MS | 39530 | 228 |
| 39531 | 228 | |
| 39532 | 228 | |
| 39533 | 228 | |
| 39534 | 228 | |
| 39535 | 228 | |
| 39540 | 228 | |
| Cuevas, MS | 39571 | 228 |
| Diberville, MS | 39540 | 228 |
| Gulfport, MS | 39501 | 228 |
| 39502 | 228 | |
| 39503 | 228 | |
| 39505 | 228 | |
| 39506 | 228 | |
| 39507 | 228 | |
| Howison, MS | 39574 | 228 |
| Keesler Air Force Base, MS | 39534 | 228 |
| Keesler Field, MS | 39534 | 228 |
| Long Beach, MS | 39560 | 228 |
| Orange Grove, MS | 39503 | 228 |
| Pass Christian, MS | 39571 | 228 |
| Saucier, MS | 39574 | 228 |
| Success, MS | 39574 | 228 |
| Us Nav Const Batt, MS | 39501 | 228 |
| West Biloxi, MS | 39531 | 228 |
| Wortham, MS | 39574 | 228 |