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
1,391,103
1,244,424
848,959
541,703
541,072
88 Counties
| County | 2026 Pop. ↓ | Area (mi²) | Density | Change (2020) |
|---|---|---|---|---|
| Franklin County | 1,391,103 | 532 | 2,615 | 5.03% |
| Cuyahoga County | 1,244,424 | 457 | 2,723 | -1.44% |
| Hamilton County | 848,959 | 405 | 2,096 | 2.23% |
| Montgomery County | 541,703 | 461 | 1,175 | 0.85% |
| Summit County | 541,072 | 413 | 1,310 | 0.23% |
| Lucas County | 426,393 | 340 | 1,254 | -1.04% |
| Butler County | 407,440 | 467 | 872 | 4.23% |
| Stark County | 376,169 | 575 | 654 | 0.43% |
| Lorain County | 327,764 | 491 | 668 | 4.54% |
| Warren County | 261,019 | 401 | 651 | 7.31% |
| Delaware County | 248,434 | 443 | 561 | 15.46% |
| Lake County | 233,152 | 229 | 1,018 | 0.27% |
| Mahoning County | 225,382 | 411 | 548 | -1.16% |
| Clermont County | 217,965 | 453 | 481 | 4.41% |
| Trumbull County | 200,192 | 618 | 324 | -0.74% |
| Licking County | 187,614 | 682 | 275 | 4.93% |
| Medina County | 185,645 | 421 | 441 | 1.65% |
| Greene County | 176,371 | 414 | 426 | 4.9% |
| Fairfield County | 172,026 | 504 | 341 | 7.88% |
| Portage County | 165,367 | 487 | 340 | 2.17% |
| Clark County | 135,485 | 396 | 342 | -0.3% |
| Wood County | 133,605 | 617 | 217 | 1.01% |
| Richland County | 124,553 | 495 | 252 | -0.35% |
| Wayne County | 116,626 | 555 | 210 | -0.24% |
| Miami County | 114,054 | 407 | 280 | 4.67% |
| Allen County | 100,896 | 403 | 250 | -1.22% |
| Columbiana County | 99,195 | 532 | 186 | -2.42% |
| Ashtabula County | 96,794 | 702 | 138 | -0.74% |
| Geauga County | 95,308 | 400 | 238 | -0.08% |
| Tuscarawas County | 92,110 | 568 | 162 | -1.17% |
| Muskingum County | 87,122 | 665 | 131 | 0.76% |
| Union County | 75,633 | 432 | 175 | 19.88% |
| Ross County | 75,458 | 689 | 110 | -2.09% |
| Hancock County | 75,354 | 531 | 142 | 0.58% |
| Erie County | 73,273 | 251 | 292 | -2.93% |
| Scioto County | 71,042 | 610 | 116 | -3.8% |
| Marion County | 65,272 | 404 | 162 | -0.18% |
| Knox County | 64,856 | 525 | 124 | 3.29% |
| Pickaway County | 64,346 | 501 | 128 | 9.69% |
| Belmont County | 64,116 | 532 | 121 | -3.28% |
| Athens County | 63,716 | 504 | 126 | 2.14% |
| Jefferson County | 63,468 | 408 | 156 | -2.64% |
| Sandusky County | 59,028 | 408 | 145 | 0.25% |
| Huron County | 57,988 | 492 | 118 | -0.87% |
| Washington County | 57,970 | 632 | 92 | -2.83% |
| Lawrence County | 55,211 | 453 | 122 | -5.04% |
| Seneca County | 54,934 | 551 | 100 | -0.22% |
| Ashland County | 52,894 | 423 | 125 | 0.8% |
| Darke County | 51,522 | 598 | 86 | -0.72% |
| Shelby County | 48,286 | 408 | 118 | 0.27% |
| Madison County | 47,257 | 467 | 101 | 7.75% |
| Logan County | 46,165 | 459 | 101 | 0.11% |
| Auglaize County | 45,730 | 401 | 114 | -1.6% |
| Brown County | 45,208 | 490 | 92 | 3.49% |
| Holmes County | 45,126 | 423 | 107 | 2.01% |
| Highland County | 44,179 | 553 | 80 | 1.88% |
| Mercer County | 43,048 | 462 | 93 | 1.21% |
| Fulton County | 42,182 | 405 | 104 | -1.07% |
| Clinton County | 42,113 | 409 | 103 | 0.19% |
| Crawford County | 41,696 | 402 | 104 | -0.76% |
| Preble County | 41,277 | 424 | 97 | 0.64% |
| Ottawa County | 39,438 | 255 | 155 | -2.13% |
| Defiance County | 39,058 | 411 | 95 | 2.07% |
| Champaign County | 39,007 | 429 | 91 | 0.68% |
| Guernsey County | 38,405 | 522 | 74 | -0.04% |
| Coshocton County | 37,277 | 564 | 66 | 1.86% |
| Morrow County | 36,615 | 406 | 90 | 4.67% |
| Williams County | 36,530 | 421 | 87 | -1.49% |
| Perry County | 35,892 | 408 | 88 | 1.23% |
| Putnam County | 34,110 | 483 | 71 | -0.86% |
| Jackson County | 32,831 | 420 | 78 | 0.49% |
| Hardin County | 30,394 | 470 | 65 | -1.07% |
| Van Wert County | 29,211 | 409 | 71 | 1.01% |
| Gallia County | 28,730 | 467 | 62 | -1.74% |
| Fayette County | 28,684 | 406 | 71 | -1.01% |
| Adams County | 27,929 | 584 | 48 | 1.74% |
| Henry County | 27,518 | 416 | 66 | -0.56% |
| Pike County | 27,229 | 440 | 62 | 0.57% |
| Hocking County | 27,153 | 421 | 64 | -3.18% |
| Carroll County | 25,872 | 395 | 65 | -3.11% |
| Wyandot County | 21,250 | 407 | 52 | -2.81% |
| Meigs County | 20,929 | 430 | 49 | -5.56% |
| Paulding County | 18,809 | 416 | 45 | 0.01% |
| Noble County | 14,117 | 398 | 35 | 0.07% |
| Harrison County | 13,760 | 402 | 34 | -5.05% |
| Morgan County | 13,344 | 416 | 32 | -2.97% |
| Monroe County | 12,823 | 456 | 28 | -3.99% |
| Vinton County | 12,639 | 412 | 31 | -1.32% |
Overview of Ohio Counties
There are 88 counties in Ohio.
Franklin County is the largest county in the state, with a population of 1,391,103. The most recent census shows that its population has increased by 0.05% since the previous census.
A number of other Ohio counties also boast relatively large populations for their state, though not able to match the density of Franklin County:
- Cuyahoga County : 1,244,424
- Hamilton County : 848,959
Ohio Counties with the Fewest Residents
The smallest county in Ohio is Vinton County , with a population of just 12,639. This total represents a decrease of 0.0% since the last census count was performed.
Other small counties include:
- Monroe County : 12,823
- Morgan County : 13,344
- Harrison County : 13,760
Ohio Counties with Rapid Growth
Union County , with its current population of 75,633, has shown the largest population growth, with an increase of 0.2% since the last census.
Franklin County has also had relatively high population growth of 0.05% with 1,391,103 residents.
On the other hand, Meigs County has had the largest decrease in population, with its 20,929 current residents totalling 0.1% less than the previous census.
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)