Ohio Counties by Population (2026)
2026 Pop.
100K
200K
300K
400K
500K
600K
700K
800K
900K
1M
1.1M
1.2M
1.3M
Top 5 Most Populous Counties
1,370,416
1,232,236
838,977
542,266
539,807
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| Franklin County | 1,370,416 | 532 | 2,576 | 3.47% |
| Cuyahoga County | 1,232,236 | 457 | 2,696 | -2.41% |
| Hamilton County | 838,977 | 405 | 2,072 | 1.03% |
| Montgomery County | 542,266 | 461 | 1,176 | 0.96% |
| Summit County | 539,807 | 413 | 1,307 | 0% |
| Lucas County | 422,439 | 340 | 1,242 | -1.95% |
| Butler County | 402,475 | 467 | 862 | 2.98% |
| Stark County | 374,302 | 575 | 651 | -0.05% |
| Lorain County | 325,279 | 491 | 662 | 3.75% |
| Warren County | 259,323 | 401 | 647 | 6.62% |
| Delaware County | 247,201 | 443 | 558 | 14.88% |
| Lake County | 232,294 | 229 | 1,014 | -0.1% |
| Mahoning County | 224,635 | 411 | 547 | -1.48% |
| Clermont County | 219,640 | 453 | 485 | 5.22% |
| Trumbull County | 198,130 | 618 | 321 | -1.75% |
| Licking County | 186,788 | 682 | 274 | 4.48% |
| Medina County | 185,775 | 421 | 441 | 1.72% |
| Greene County | 176,496 | 414 | 426 | 4.97% |
| Fairfield County | 171,798 | 504 | 341 | 7.74% |
| Portage County | 163,601 | 487 | 336 | 1.08% |
| Wood County | 135,280 | 617 | 219 | 2.29% |
| Clark County | 134,510 | 396 | 340 | -1.01% |
| Richland County | 124,829 | 495 | 252 | -0.11% |
| Wayne County | 116,941 | 555 | 211 | 0.04% |
| Miami County | 113,396 | 407 | 279 | 4.06% |
| Allen County | 100,810 | 403 | 250 | -1.28% |
| Columbiana County | 99,078 | 532 | 186 | -2.54% |
| Ashtabula County | 96,678 | 702 | 138 | -0.84% |
| Geauga County | 96,052 | 400 | 240 | 0.7% |
| Tuscarawas County | 92,514 | 568 | 163 | -0.74% |
| Muskingum County | 87,707 | 665 | 132 | 1.46% |
| Ross County | 76,860 | 689 | 112 | -0.27% |
| Hancock County | 75,307 | 531 | 142 | 0.49% |
| Union County | 74,909 | 432 | 173 | 18.77% |
| Erie County | 72,947 | 251 | 291 | -3.34% |
| Scioto County | 70,906 | 610 | 116 | -3.99% |
| Marion County | 65,353 | 404 | 162 | -0.05% |
| Knox County | 64,440 | 525 | 123 | 2.6% |
| Belmont County | 64,104 | 532 | 120 | -3.29% |
| Pickaway County | 63,749 | 501 | 127 | 8.68% |
| Jefferson County | 63,326 | 408 | 155 | -2.81% |
| Athens County | 63,314 | 504 | 126 | 1.49% |
| Sandusky County | 58,659 | 408 | 144 | -0.38% |
| Huron County | 58,272 | 492 | 118 | -0.37% |
| Washington County | 58,179 | 632 | 92 | -2.48% |
| Lawrence County | 55,463 | 453 | 122 | -4.61% |
| Seneca County | 54,350 | 551 | 99 | -1.29% |
| Ashland County | 52,611 | 423 | 124 | 0.24% |
| Darke County | 51,595 | 598 | 86 | -0.59% |
| Madison County | 48,182 | 467 | 103 | 9.84% |
| Shelby County | 48,178 | 408 | 118 | 0.04% |
| Logan County | 46,532 | 459 | 101 | 0.9% |
| Auglaize County | 45,882 | 401 | 114 | -1.26% |
| Holmes County | 45,197 | 423 | 107 | 2.17% |
| Brown County | 44,631 | 490 | 91 | 2.17% |
| Highland County | 43,942 | 553 | 79 | 1.34% |
| Mercer County | 42,954 | 462 | 93 | 0.99% |
| Clinton County | 42,556 | 409 | 104 | 1.24% |
| Crawford County | 42,252 | 402 | 105 | 0.57% |
| Fulton County | 41,631 | 405 | 103 | -2.38% |
| Preble County | 40,610 | 424 | 96 | -0.97% |
| Ottawa County | 39,233 | 255 | 154 | -2.65% |
| Champaign County | 38,923 | 429 | 91 | 0.47% |
| Guernsey County | 38,429 | 522 | 74 | 0.01% |
| Defiance County | 38,251 | 411 | 93 | -0.04% |
| Coshocton County | 37,377 | 564 | 66 | 2.15% |
| Morrow County | 36,602 | 406 | 90 | 4.59% |
| Williams County | 36,477 | 421 | 87 | -1.64% |
| Perry County | 36,131 | 408 | 89 | 1.9% |
| Putnam County | 34,600 | 483 | 72 | 0.6% |
| Jackson County | 32,893 | 420 | 78 | 0.68% |
| Hardin County | 29,890 | 470 | 64 | -2.71% |
| Gallia County | 29,188 | 467 | 63 | -0.13% |
| Van Wert County | 29,160 | 409 | 71 | 0.82% |
| Fayette County | 28,395 | 406 | 70 | -1.98% |
| Adams County | 28,088 | 584 | 48 | 2.32% |
| Henry County | 27,691 | 416 | 67 | 0.1% |
| Hocking County | 27,564 | 421 | 65 | -1.7% |
| Pike County | 27,046 | 440 | 61 | -0.07% |
| Carroll County | 26,383 | 395 | 67 | -1.41% |
| Meigs County | 21,612 | 430 | 50 | -2.51% |
| Wyandot County | 21,575 | 407 | 53 | -1.38% |
| Paulding County | 18,697 | 416 | 45 | -0.6% |
| Noble County | 14,288 | 398 | 36 | 1.35% |
| Harrison County | 14,041 | 402 | 35 | -3.15% |
| Morgan County | 13,647 | 416 | 33 | -0.79% |
| Monroe County | 12,921 | 456 | 28 | -3.21% |
| Vinton County | 12,733 | 412 | 31 | -0.55% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)