Ohio Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Ohio was 11.77M. Among all Ohio counties, Franklin was the most populated county (1.31M), followed by Cuyahoga (1.26M), and then Hamilton (826.79K).
On the other hand, the least populated counties were: Vinton (12.85K), Monroe (13.51K), and Morgan (13.96K).
The chart and table below shows the population of each county and the percentage of Ohio population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Ohio ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Ohio Population By County in 2021
Ohio Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 27564 | 0.23 |
| Allen | 102462 | 0.87 |
| Ashland | 52658 | 0.45 |
| Ashtabula | 97869 | 0.83 |
| Athens | 62933 | 0.54 |
| Auglaize | 46282 | 0.39 |
| Belmont | 67077 | 0.57 |
| Brown | 43694 | 0.37 |
| Butler | 387830 | 3.30 |
| Carroll | 26866 | 0.23 |
| Champaign | 38678 | 0.33 |
| Clark | 136032 | 1.16 |
| Clermont | 207650 | 1.76 |
| Clinton | 42046 | 0.36 |
| Columbiana | 102331 | 0.87 |
| Coshocton | 36621 | 0.31 |
| Crawford | 41939 | 0.36 |
| Cuyahoga | 1263667 | 10.74 |
| Darke | 51839 | 0.44 |
| Defiance | 38329 | 0.33 |
| Delaware | 211121 | 1.79 |
| Erie | 75560 | 0.64 |
| Fairfield | 157622 | 1.34 |
| Fayette | 28897 | 0.25 |
| Franklin | 1313598 | 11.16 |
| Fulton | 42709 | 0.36 |
| Gallia | 29369 | 0.25 |
| Geauga | 95408 | 0.81 |
| Greene | 167043 | 1.42 |
| Guernsey | 38542 | 0.33 |
| Hamilton | 826790 | 7.03 |
| Hancock | 75139 | 0.64 |
| Hardin | 30738 | 0.26 |
| Harrison | 14623 | 0.12 |
| Henry | 27618 | 0.24 |
| Highland | 43162 | 0.37 |
| Hocking | 28180 | 0.24 |
| Holmes | 44166 | 0.38 |
| Huron | 58583 | 0.50 |
| Jackson | 32531 | 0.28 |
| Jefferson | 65620 | 0.56 |
| Knox | 62399 | 0.53 |
| Lake | 232202 | 1.97 |
| Lawrence | 58570 | 0.50 |
| Licking | 177454 | 1.51 |
| Logan | 45997 | 0.39 |
| Lorain | 311737 | 2.65 |
| Lucas | 431212 | 3.66 |
| Madison | 43947 | 0.37 |
| Mahoning | 229044 | 1.95 |
| Marion | 65515 | 0.56 |
| Medina | 181448 | 1.54 |
| Meigs | 22361 | 0.19 |
| Mercer | 42154 | 0.36 |
| Miami | 107899 | 0.92 |
| Monroe | 13514 | 0.12 |
| Montgomery | 536136 | 4.56 |
| Morgan | 13955 | 0.12 |
| Morrow | 34892 | 0.30 |
| Muskingum | 86346 | 0.73 |
| Noble | 14166 | 0.12 |
| Ottawa | 40479 | 0.34 |
| Paulding | 18858 | 0.16 |
| Perry | 35439 | 0.30 |
| Pickaway | 58458 | 0.50 |
| Pike | 27271 | 0.23 |
| Portage | 161897 | 1.38 |
| Preble | 41027 | 0.35 |
| Putnam | 34395 | 0.29 |
| Richland | 124504 | 1.06 |
| Ross | 77205 | 0.66 |
| Sandusky | 59013 | 0.50 |
| Scioto | 74392 | 0.63 |
| Seneca | 55166 | 0.47 |
| Shelby | 48307 | 0.41 |
| Stark | 374712 | 3.18 |
| Summit | 540567 | 4.59 |
| Trumbull | 202199 | 1.72 |
| Tuscarawas | 93025 | 0.79 |
| Union | 61769 | 0.53 |
| Van Wert | 28808 | 0.25 |
| Vinton | 12853 | 0.11 |
| Warren | 239556 | 2.04 |
| Washington | 59942 | 0.51 |
| Wayne | 116858 | 0.99 |
| Williams | 37026 | 0.32 |
| Wood | 131930 | 1.12 |
| Wyandot | 21933 | 0.19 |