Founded in 1812, Hancock County is one of 82 counties in the state of Mississippi. Historically, Hancock County was formed from Un-Organized. The city of Bay St. Louis is the county seat. With FIPS code of 45, Hancock County has a population of 46,055 and area of 477 square miles (1,235 km2).
List of all cities in Hancock County, MS alphabetically
| City/Town | Postal Code | Area Code |
| Ansley, MS | 39558 | 228 |
| Bay Saint Louis, MS | 39520 | 228 |
| 39521 | 228 | |
| 39522 | 228 | |
| 39525 | 228 | |
| 39529 | 228 | |
| Bayside Park, MS | 39520 | 228 |
| Belle Isle, MS | 39572 | 228 |
| Clermont Harbor, MS | 39558 | 228 |
| Diamondhead, MS | 39525 | 228 |
| Kiln, MS | 39556 | 228 |
| Lakeshore, MS | 39558 | 228 |
| Mississippi Test Facility, MS | 39520 | 228 |
| 39529 | 228 | |
| National Space Technology La, MS | 39529 | 228 |
| Naval Ocean O Graphic, MS | 39522 | 228 |
| Navocean O, MS | 39522 | 228 |
| North S T L, MS | 39529 | 228 |
| Pearlington, MS | 39572 | 228 |
| Saint Louis, MS | 39520 | 228 |
| Stennis Center, MS | 39522 | 228 |
| Stennis Space Center, MS | 39522 | 228 |
| 39529 | 228 | |
| Waveland, MS | 39576 | 228 |