| River Basins | Hydrologic Unit Codes | Florida Counties | Georgia Counties |
| Alapaha (FL/GA) | 3110202 | Alachua | Atkinson |
| Little Withlacoochee (GA) | 3110204 | Baker | Bacon |
| Lower Suwannee (FL) | 3110205 | Bradford | Ben Hill |
| Santa Fe (FL) | 3110206 | Clay | Berrien |
| Satilla (GA) | 3070201 | Columbia | Brantley |
| St. Marys (FL/GA) | 3070204 | Dixie | Brooks |
| Upper Suwannee (FL/GA) | 3110201 | Duval | Camden |
| Withlacoochee (FL/GA) | 3110203 | Gilchrist | Clinch |
| Hamilton | Coffee | ||
| Lafayette | Colquit | ||
| Levy | Cook | ||
| Madison | Crisp | ||
| Nassau | Dooly | ||
| Putnam | Echols | ||
| Taylor | Irwin | ||
| Union | Jeff Davis | ||
| Lanier | |||
| Lowndes | |||
| Pierce | |||
| Thomas | |||
| Tift | |||
| Turner | |||
| Ware | |||
| Wayne | |||
| Wilcox | |||
| Worth |