Ohio Population By County in 2020
Updated on June 16, 2025.
Based on the US Census Vintage data estimates, in 2020, the population of Ohio was 11,798,905. Among all Ohio counties, Franklin had the highest population (1,324,505), followed by Cuyahoga (1,262,635), and Hamilton (830,418). Vinton was the least populated county (12,808).
Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.
You can see similar information for other states and by state for the United States.
Related Topics: Ohio Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Ohio Population By County in 2020
Ohio Population By County in 2020
Items per page:
25
0 of 0
| County | Population | % of State Population |
|---|---|---|
| Adams | 27451 | 0.23 |
| Allen | 102137 | 0.87 |
| Ashland | 52476 | 0.45 |
| Ashtabula | 97512 | 0.83 |
| Athens | 62380 | 0.53 |
| Auglaize | 46473 | 0.39 |
| Belmont | 66291 | 0.56 |
| Brown | 43684 | 0.37 |
| Butler | 390887 | 3.31 |
| Carroll | 26702 | 0.23 |
| Champaign | 38743 | 0.33 |
| Clark | 135894 | 1.15 |
| Clermont | 208755 | 1.77 |
| Clinton | 42035 | 0.36 |
| Columbiana | 101650 | 0.86 |
| Coshocton | 36595 | 0.31 |
| Crawford | 42015 | 0.36 |
| Cuyahoga | 1262635 | 10.70 |
| Darke | 51897 | 0.44 |
| Defiance | 38267 | 0.32 |
| Delaware | 215162 | 1.82 |
| Erie | 75482 | 0.64 |
| Fairfield | 159464 | 1.35 |
| Fayette | 28978 | 0.25 |
| Franklin | 1324505 | 11.23 |
| Fulton | 42640 | 0.36 |
| Gallia | 29240 | 0.25 |
| Geauga | 95385 | 0.81 |
| Greene | 168130 | 1.43 |
| Guernsey | 38419 | 0.33 |
| Hamilton | 830418 | 7.04 |
| Hancock | 74919 | 0.64 |
| Hardin | 30722 | 0.26 |
| Harrison | 14492 | 0.12 |
| Henry | 27672 | 0.24 |
| Highland | 43364 | 0.37 |
| Hocking | 28046 | 0.24 |
| Holmes | 44236 | 0.38 |
| Huron | 58495 | 0.50 |
| Jackson | 32671 | 0.28 |
| Jefferson | 65186 | 0.55 |
| Knox | 62792 | 0.53 |
| Lake | 232527 | 1.97 |
| Lawrence | 58141 | 0.49 |
| Licking | 178796 | 1.52 |
| Logan | 46114 | 0.39 |
| Lorain | 313534 | 2.66 |
| Lucas | 430870 | 3.65 |
| Madison | 43858 | 0.37 |
| Mahoning | 228017 | 1.93 |
| Marion | 65390 | 0.55 |
| Medina | 182639 | 1.55 |
| Meigs | 22160 | 0.19 |
| Mercer | 42532 | 0.36 |
| Miami | 108962 | 0.92 |
| Monroe | 13356 | 0.11 |
| Montgomery | 537139 | 4.55 |
| Morgan | 13752 | 0.12 |
| Morrow | 34983 | 0.30 |
| Muskingum | 86464 | 0.73 |
| Noble | 14107 | 0.12 |
| Ottawa | 40298 | 0.34 |
| Paulding | 18807 | 0.16 |
| Perry | 35455 | 0.30 |
| Pickaway | 58664 | 0.50 |
| Pike | 27076 | 0.23 |
| Portage | 161854 | 1.37 |
| Preble | 41016 | 0.35 |
| Putnam | 34407 | 0.29 |
| Richland | 124988 | 1.06 |
| Ross | 77068 | 0.65 |
| Sandusky | 58878 | 0.50 |
| Scioto | 73852 | 0.63 |
| Seneca | 55055 | 0.47 |
| Shelby | 48154 | 0.41 |
| Stark | 374552 | 3.17 |
| Summit | 539835 | 4.58 |
| Trumbull | 201682 | 1.71 |
| Tuscarawas | 93199 | 0.79 |
| Union | 63090 | 0.54 |
| Van Wert | 28919 | 0.25 |
| Vinton | 12808 | 0.11 |
| Warren | 243236 | 2.06 |
| Washington | 59656 | 0.51 |
| Wayne | 116903 | 0.99 |
| Williams | 37084 | 0.31 |
| Wood | 132267 | 1.12 |
| Wyandot | 21864 | 0.19 |