1850 Counties of Florida
| County | Description | Area in sq miles | Courts held at | Pop in 1850 |
| Alachua | northern part on eastern margin of Sawannee river, drained by Wakassassee & Withiacochee rivers | 2500 | Newmansvile | 2,524 |
| Benton | on western side, between Withlacooche river & Gulf of Mexico | 120 | Melendez | 926 |
| Calhoun | Southwest boundary, between Apalachicola river & Gulf of Mexico | 1,100 | St Joseph | 1,377 |
| Columbia | north boundary, with Suwanne river on west | 4,320 | Lancaster | 4,808 |
| Dade | southern boundary, Gulf stream on south & east, including several islands or keys, mostly everglades | 5000 | Key Biscayune | 159 |
| Duval | northeastern part, Atlantic ocean on the east | 720 | Jacksonville | 4,539 |
| Escambia | northwest corner, Pensacola bay & Gulf of Mexico on the south | 600 | Pensacola | 4,351 |
| Franklin | southern shore of the western section, on the Gulf of Mexico. Appalachicola river on west | 700 | Appalachicola | 1,561 |
| Gadsden | northern boundary, Appalachicola river on west | 1800 | Quincy | 8,783 |
| Hamilton | northern boundary, Suwanee river on east & south side, Withlacooshee river on west | not listed | Jasper | 2,469 |
| Hillsborough | western coast, Gulf of Mexico, Tampa bay & Charlotte harbor on west | blank | Fort Brooke | 2,377 |
| Holmes | northern boundary, crossed by Choctawhatchee river | blank | Cerro Gordo | 1,644 |
| Jackson | northern boundary, Chattahoochee & Appalachicola rivers on east | 1500 | Mariana | 6,639 |
| Jefferson | north boundary, Gulf of Mexico on south | 702 | Monticello | 7,718 |
| Leon | north boundary, Ocklockony river on west | 1224 | Tallahassee (Capital) | 11,442 |
| Levy | western part, on Gulf of Mexico | blank | blank | 465 |
| Madison | northern boundary, Gulf of Mexico on southwest, Suwanee river on east | blank | Madison | 5,490 |
| Marion | central part, crossed by Ocklawaha river | blank | blank | 3,338 |
| Monroe | southern part, Gulf of Mexico on southwest | blank | Key West | 2,643 |
| Nassau | northeast corner, St Mary's river on west & Atlantic ocean on east | 576 | Nassau Court House | 2,164 |
| Orange | east boundary, Atlantic ocean on east | blank | Melonville | 466 |
| St John's | east boundary, Atlantic ocean on east, crossed by St John's river, abounding with everglades | 1450 | St Augustine | 2,525 |
| Wakulla | south boundary, Gulf od Mexico on south, Ocklockony river of west | blank | blank | blank |
| Walton | northern boundary, Choctawhatchee bay on south, Choctawhatchee river on east | 1584 | Euchee Anna | 1,379 |
| Washington | on southern boundary, gulf of Mexico on sout, Choctawhatchee river & bay on west | 1500 | Roche's Bluff | 1,950 |