Founded in 1858, Clay County is one of 67 counties in the state of Florida. Historically, Clay County was formed from Duval. The city of Green Cove Springs is the county seat. With FIPS code of 19, Clay County has a population of 222,361 and area of 601 square miles (1,557 km2).
List of all cities in Clay County, FL alphabetically
| City/Town | Postal Code | Area Code |
| Doctors Inlet, FL | 32030 | 904 |
| Fleming Island, FL | 32003 | 904 |
| 32006 | 904 | |
| Fleming Isle, FL | 32003 | 904 |
| 32006 | 904 | |
| Green Cove Springs, FL | 32043 | 904 |
| Keystone Heights, FL | 32656 | 352 |
| Lake Geneva, FL | 32160 | 352 |
| Middleburg, FL | 32050 | 904 |
| 32068 | 904 | |
| Orange Park, FL | 32003 | 904 |
| 32006 | 904 | |
| 32065 | 904 | |
| 32067 | 904 | |
| 32073 | 904 | |
| Penney Farms, FL | 32079 | 904 |
Map of Cities in Clay County, FL
