| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Sumter County | 1 | 26.76% | 165,161 | 130,290 |
| St. Johns County | 2 | 24.93% | 346,186 | 277,099 |
| St. Lucie County | 3 | 21.59% | 402,986 | 331,441 |
| Walton County | 4 | 21.48% | 92,254 | 75,941 |
| Flagler County | 5 | 21.35% | 140,801 | 116,028 |
| Polk County | 6 | 20.28% | 878,226 | 730,158 |
| Pasco County | 7 | 20.23% | 680,706 | 566,156 |
| Osceola County | 8 | 19.72% | 468,266 | 391,141 |
| Nassau County | 9 | 19.58% | 108,851 | 91,031 |
| Hendry County | 10 | 18.87% | 47,217 | 39,723 |
| Lake County | 11 | 17.35% | 453,206 | 386,216 |
| Gilchrist County | 12 | 16.08% | 20,757 | 17,882 |
| Marion County | 13 | 15.77% | 437,003 | 377,472 |
| Manatee County | 14 | 15.77% | 464,947 | 401,619 |
| Bay County | 15 | 15.68% | 201,887 | 174,525 |
| Gulf County | 16 | 15.58% | 16,481 | 14,259 |
| Wakulla County | 17 | 15.09% | 39,009 | 33,893 |
| Hernando County | 18 | 14.79% | 224,551 | 195,624 |
| Levy County | 19 | 14.1% | 49,129 | 43,059 |
| Charlotte County | 20 | 13.43% | 213,238 | 187,995 |
| Citrus County | 21 | 13.27% | 175,072 | 154,568 |
| Santa Rosa County | 22 | 12.74% | 213,088 | 189,011 |
| Jefferson County | 23 | 12.59% | 16,212 | 14,399 |
| Lee County | 24 | 12.2% | 858,937 | 765,547 |
| Clay County | 25 | 11.46% | 244,049 | 218,951 |
| Glades County | 26 | 11.21% | 13,432 | 12,078 |
| Collier County | 27 | 10.76% | 417,898 | 377,310 |
| Sarasota County | 28 | 10.48% | 481,935 | 436,237 |
| Brevard County | 29 | 10.14% | 670,523 | 608,775 |
| Volusia County | 30 | 10.07% | 611,741 | 555,776 |
| Highlands County | 31 | 10.06% | 111,544 | 101,349 |
| Okeechobee County | 32 | 9.79% | 43,535 | 39,652 |
| DeSoto County | 33 | 9.42% | 37,297 | 34,086 |
| Suwannee County | 34 | 9.32% | 47,580 | 43,524 |
| Indian River County | 35 | 8.98% | 174,851 | 160,446 |
| Dixie County | 36 | 8.8% | 18,155 | 16,687 |
| Columbia County | 37 | 8.19% | 75,449 | 69,740 |
| Hillsborough County | 38 | 7.74% | 1,579,746 | 1,466,255 |
| Madison County | 39 | 6.87% | 19,097 | 17,869 |
| Putnam County | 40 | 6.84% | 78,393 | 73,372 |
| Duval County | 41 | 6.08% | 1,058,444 | 997,784 |
| Lafayette County | 42 | 5.62% | 8,680 | 8,218 |
| Orange County | 43 | 5.52% | 1,510,726 | 1,431,679 |
| Seminole County | 44 | 5.11% | 495,567 | 471,455 |
| Baker County | 45 | 5.04% | 29,532 | 28,116 |
| Okaloosa County | 46 | 4.89% | 222,464 | 212,085 |
| Holmes County | 47 | 4.84% | 20,526 | 19,578 |
| Jackson County | 48 | 4.8% | 49,356 | 47,096 |
| Martin County | 49 | 4.6% | 165,971 | 158,671 |
| Palm Beach County | 50 | 4.51% | 1,561,669 | 1,494,282 |
| Alachua County | 51 | 3.63% | 289,900 | 279,737 |
| Escambia County | 52 | 3.25% | 333,064 | 322,568 |
| Gadsden County | 53 | 3% | 44,713 | 43,411 |
| Bradford County | 54 | 2.69% | 28,982 | 28,222 |
| Washington County | 55 | 2.67% | 25,996 | 25,320 |
| Franklin County | 56 | 2.65% | 12,798 | 12,468 |
| Broward County | 57 | 2.59% | 1,993,815 | 1,943,398 |
| Hardee County | 58 | 2.52% | 25,978 | 25,339 |
| Hamilton County | 59 | 2.16% | 14,025 | 13,729 |
| Taylor County | 60 | 1.73% | 22,120 | 21,743 |
| Liberty County | 61 | 1.13% | 7,892 | 7,804 |
| Union County | 62 | 0.93% | 15,568 | 15,425 |
| Leon County | 63 | 0.76% | 296,175 | 293,955 |
| Miami-Dade County | 64 | 0.7% | 2,714,489 | 2,695,685 |
| Pinellas County | 65 | 0.15% | 961,204 | 959,793 |
| Calhoun County | 66 | -1.66% | 13,480 | 13,707 |
| Monroe County | 67 | -5.12% | 78,606 | 82,847 |
Florida's counties show varied growth patterns from 2020 to 2025. Sumter County leads with 26.76% annualized growth, followed by St. Johns County (24.93%) and St. Lucie County (21.59%). The largest counties are Miami-Dade County (2,714,489), Broward County (1,993,815), and Hillsborough County (1,579,746). Of the 67 counties in Florida, 65 are growing while just 2 have experienced population decline. Overall, counties averaged 9.61% annualized growth, with total population growing by 8.1% annually.