Fastest-Growing Counties in Ohio
Ohio's counties, ranked by how much their population changed between two official U.S. Census Bureau estimates.
Population change from July 1, 2020 to July 1, 2025 · all 88 counties ranked
| Rank | County | 2020 | 2025 | Change | % change |
|---|---|---|---|---|---|
| 1 | Union County | 63,069 | 73,446 | +10,377 | +16.5% |
| 2 | Delaware County | 215,181 | 242,032 | +26,851 | +12.5% |
| 3 | Pickaway County | 58,659 | 62,978 | +4,319 | +7.4% |
| 4 | Madison County | 43,864 | 46,985 | +3,121 | +7.1% |
| 5 | Fairfield County | 159,451 | 169,752 | +10,301 | +6.5% |
| 6 | Warren County | 243,211 | 257,181 | +13,970 | +5.7% |
| 7 | Clermont County | 208,751 | 216,977 | +8,226 | +3.9% |
| 8 | Licking County | 178,786 | 185,564 | +6,778 | +3.8% |
| 9 | Morrow County | 34,996 | 36,305 | +1,309 | +3.7% |
| 10 | Greene County | 168,141 | 174,322 | +6,181 | +3.7% |
| 11 | Miami County | 108,974 | 112,634 | +3,660 | +3.4% |
| 12 | Lorain County | 313,514 | 323,219 | +9,705 | +3.1% |
| 13 | Franklin County | 1,324,478 | 1,361,536 | +37,058 | +2.8% |
| 14 | Butler County | 390,845 | 400,128 | +9,283 | +2.4% |
| 15 | Knox County | 62,804 | 64,002 | +1,198 | +1.9% |
| 16 | Holmes County | 44,239 | 44,970 | +731 | +1.7% |
| 17 | Coshocton County | 36,590 | 37,188 | +598 | +1.6% |
| 18 | Brown County | 43,684 | 44,397 | +713 | +1.6% |
| 19 | Adams County | 27,451 | 27,865 | +414 | +1.5% |
| 20 | Wood County | 132,246 | 134,176 | +1,930 | +1.5% |
| 21 | Medina County | 182,636 | 185,025 | +2,389 | +1.3% |
| 22 | Athens County | 62,386 | 63,197 | +811 | +1.3% |
| 23 | Perry County | 35,459 | 35,918 | +459 | +1.3% |
| 24 | Noble County | 14,098 | 14,276 | +178 | +1.3% |
| 25 | Highland County | 43,363 | 43,823 | +460 | +1.1% |
| 26 | Hamilton County | 830,412 | 838,418 | +8,006 | +1.0% |
| 27 | Portage County | 161,853 | 163,404 | +1,551 | +1.0% |
| 28 | Muskingum County | 86,449 | 87,014 | +565 | +0.7% |
| 29 | Clinton County | 42,035 | 42,301 | +266 | +0.6% |
| 30 | Mercer County | 42,534 | 42,737 | +203 | +0.5% |
| 31 | Montgomery County | 537,115 | 539,598 | +2,483 | +0.5% |
| 32 | Jackson County | 32,671 | 32,817 | +146 | +0.4% |
| 33 | Logan County | 46,117 | 46,302 | +185 | +0.4% |
| 34 | Van Wert County | 28,922 | 29,013 | +91 | +0.3% |
| 35 | Geauga County | 95,383 | 95,676 | +293 | +0.3% |
| 36 | Champaign County | 38,741 | 38,820 | +79 | +0.2% |
| 37 | Hancock County | 74,939 | 75,034 | +95 | +0.1% |
| 38 | Ashland County | 52,485 | 52,523 | +38 | +0.1% |
| 39 | Defiance County | 38,268 | 38,292 | +24 | +0.1% |
| 40 | Pike County | 27,064 | 27,061 | -3 | -0.01% |
| 41 | Putnam County | 34,392 | 34,380 | -12 | -0.03% |
| 42 | Richland County | 124,969 | 124,893 | -76 | -0.1% |
| 43 | Wayne County | 116,899 | 116,758 | -141 | -0.1% |
| 44 | Guernsey County | 38,426 | 38,379 | -47 | -0.1% |
| 45 | Lake County | 232,517 | 232,217 | -300 | -0.1% |
| 46 | Stark County | 374,476 | 373,771 | -705 | -0.2% |
| 47 | Shelby County | 48,158 | 48,065 | -93 | -0.2% |
| 48 | Henry County | 27,663 | 27,598 | -65 | -0.2% |
| 49 | Summit County | 539,833 | 538,376 | -1,457 | -0.3% |
| 50 | Crawford County | 42,013 | 41,896 | -117 | -0.3% |
| 51 | Sandusky County | 58,880 | 58,655 | -225 | -0.4% |
| 52 | Clark County | 135,888 | 135,340 | -548 | -0.4% |
| 53 | Huron County | 58,487 | 58,250 | -237 | -0.4% |
| 54 | Marion County | 65,385 | 65,115 | -270 | -0.4% |
| 55 | Paulding County | 18,809 | 18,727 | -82 | -0.4% |
| 56 | Gallia County | 29,226 | 29,072 | -154 | -0.5% |
| 57 | Darke County | 51,901 | 51,520 | -381 | -0.7% |
| 58 | Ashtabula County | 97,497 | 96,713 | -784 | -0.8% |
| 59 | Ross County | 77,067 | 76,429 | -638 | -0.8% |
| 60 | Preble County | 41,007 | 40,664 | -343 | -0.8% |
| 61 | Tuscarawas County | 93,205 | 92,373 | -832 | -0.9% |
| 62 | Morgan County | 13,756 | 13,626 | -130 | -0.9% |
| 63 | Seneca County | 55,061 | 54,522 | -539 | -1.0% |
| 64 | Carroll County | 26,761 | 26,475 | -286 | -1.1% |
| 65 | Auglaize County | 46,466 | 45,909 | -557 | -1.2% |
| 66 | Allen County | 102,116 | 100,881 | -1,235 | -1.2% |
| 67 | Vinton County | 12,803 | 12,645 | -158 | -1.2% |
| 68 | Trumbull County | 201,664 | 198,972 | -2,692 | -1.3% |
| 69 | Wyandot County | 21,878 | 21,567 | -311 | -1.4% |
| 70 | Fayette County | 28,969 | 28,552 | -417 | -1.4% |
| 71 | Williams County | 37,084 | 36,549 | -535 | -1.4% |
| 72 | Mahoning County | 228,006 | 224,706 | -3,300 | -1.4% |
| 73 | Lucas County | 430,831 | 423,347 | -7,484 | -1.7% |
| 74 | Fulton County | 42,647 | 41,853 | -794 | -1.9% |
| 75 | Hocking County | 28,040 | 27,512 | -528 | -1.9% |
| 76 | Ottawa County | 40,303 | 39,481 | -822 | -2.0% |
| 77 | Hardin County | 30,724 | 30,072 | -652 | -2.1% |
| 78 | Washington County | 59,657 | 58,389 | -1,268 | -2.1% |
| 79 | Columbiana County | 101,661 | 99,377 | -2,284 | -2.2% |
| 80 | Cuyahoga County | 1,262,619 | 1,232,925 | -29,694 | -2.4% |
| 81 | Jefferson County | 65,159 | 63,597 | -1,562 | -2.4% |
| 82 | Meigs County | 22,168 | 21,587 | -581 | -2.6% |
| 83 | Monroe County | 13,350 | 12,994 | -356 | -2.7% |
| 84 | Belmont County | 66,285 | 64,434 | -1,851 | -2.8% |
| 85 | Erie County | 75,471 | 73,296 | -2,175 | -2.9% |
| 86 | Harrison County | 14,498 | 14,070 | -428 | -3.0% |
| 87 | Scioto County | 73,849 | 71,365 | -2,484 | -3.4% |
| 88 | Lawrence County | 58,146 | 55,710 | -2,436 | -4.2% |
About this ranking
- Source
- U.S. Census Bureau — County Resident Population Estimates (CO-EST2025-ALLDATA), Vintage 2025
- Reference interval
- July 1, 2020 to July 1, 2025, both from the same release
- Universe
- 88 counties in Ohio; 88 ranked
- Ranked by
- Percentage change, largest increase first
- Formula
- Change = 2025 estimate − 2020 estimate; percentage = change ÷ 2020 estimate × 100
- Ties
- Counties with equal percentage change share a rank; their display order is settled by name and then by official Census geographic identifier, so the order is the same everywhere.
A percentage change can look large when the starting population is small, which is why every row shows both endpoint estimates and the numeric change beside it. These estimates record how a county's population changed, not why it changed.