Ranking of Ohio Counties By Population in 2021
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2021, the Population for Ohio was 11.77M. Among all Ohio counties, Franklin County had the highest population (1.32M), followed by Cuyahoga County (1.25M), and Hamilton County (827.56K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Ohio counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Ohio Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2021 Census.
See this for other years:
Ranking of Ohio Counties By Population in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Franklin County | 1317840 |
| 2 | Cuyahoga County | 1247735 |
| 3 | Hamilton County | 827564 |
| 4 | Summit County | 537516 |
| 5 | Montgomery County | 536229 |
| 6 | Lucas County | 429535 |
| 7 | Butler County | 387671 |
| 8 | Stark County | 373861 |
| 9 | Lorain County | 314301 |
| 10 | Warren County | 246868 |
| 11 | Lake County | 232261 |
| 12 | Mahoning County | 226559 |
| 13 | Delaware County | 221304 |
| 14 | Clermont County | 209919 |
| 15 | Trumbull County | 201594 |
| 16 | Medina County | 183403 |
| 17 | Licking County | 180051 |
| 18 | Greene County | 168250 |
| 19 | Fairfield County | 161245 |
| 20 | Portage County | 159086 |
| 21 | Clark County | 135490 |
| 22 | Wood County | 130340 |
| 23 | Richland County | 125382 |
| 24 | Wayne County | 116160 |
| 25 | Miami County | 109426 |
| 26 | Allen County | 101800 |
| 27 | Columbiana County | 101372 |
| 28 | Ashtabula County | 97470 |
| 29 | Geauga County | 95716 |
| 30 | Tuscarawas County | 92631 |
| 31 | Muskingum County | 86585 |
| 32 | Ross County | 76526 |
| 33 | Erie County | 74894 |
| 34 | Hancock County | 74755 |
| 35 | Scioto County | 72998 |
| 36 | Belmont County | 65909 |
| 37 | Marion County | 65330 |
| 38 | Union County | 65119 |
| 39 | Jefferson County | 65101 |
| 40 | Knox County | 62539 |
| 41 | Washington County | 59504 |
| 42 | Athens County | 59090 |
| 43 | Pickaway County | 58781 |
| 44 | Sandusky County | 58769 |
| 45 | Huron County | 58416 |
| 46 | Lawrence County | 57415 |
| 47 | Seneca County | 54876 |
| 48 | Ashland County | 52193 |
| 49 | Darke County | 51655 |
| 50 | Shelby County | 48032 |
| 51 | Auglaize County | 46261 |
| 52 | Logan County | 46160 |
| 53 | Madison County | 44447 |
| 54 | Holmes County | 44367 |
| 55 | Brown County | 43708 |
| 56 | Highland County | 43453 |
| 57 | Fulton County | 42500 |
| 58 | Mercer County | 42387 |
| 59 | Clinton County | 42130 |
| 60 | Crawford County | 41793 |
| 61 | Preble County | 40886 |
| 62 | Ottawa County | 40175 |
| 63 | Champaign County | 38800 |
| 64 | Guernsey County | 38283 |
| 65 | Defiance County | 38182 |
| 66 | Williams County | 36770 |
| 67 | Coshocton County | 36674 |
| 68 | Perry County | 35478 |
| 69 | Morrow County | 35211 |
| 70 | Putnam County | 34371 |
| 71 | Jackson County | 32551 |
| 72 | Hardin County | 30444 |
| 73 | Gallia County | 29235 |
| 74 | Fayette County | 28935 |
| 75 | Van Wert County | 28793 |
| 76 | Hocking County | 28109 |
| 77 | Adams County | 27589 |
| 78 | Henry County | 27565 |
| 79 | Pike County | 27103 |
| 80 | Carroll County | 26702 |
| 81 | Meigs County | 22084 |
| 82 | Wyandot County | 21693 |
| 83 | Paulding County | 18900 |
| 84 | Harrison County | 14463 |
| 85 | Noble County | 14326 |
| 86 | Morgan County | 13697 |
| 87 | Monroe County | 13339 |
| 88 | Vinton County | 12714 |