88 counties
| County | Declarations | Major disasters | Most common hazard | Latest | Population 2024 |
|---|---|---|---|---|---|
| Belmont County | 22 | 17 | Severe Storm | 2020 | 64,692 |
| Jefferson County | 22 | 17 | Severe Storm | 2020 | 63,900 |
| Monroe County | 22 | 18 | Severe Storm | 2020 | 13,051 |
| Franklin County | 21 | 15 | Severe Storm | 2026 | 1,356,303 |
| Licking County | 21 | 16 | Severe Storm | 2026 | 184,898 |
| Perry County | 20 | 15 | Severe Storm | 2026 | 35,682 |
| Washington County | 20 | 15 | Severe Storm | 2020 | 58,332 |
| Adams County | 19 | 15 | Severe Storm | 2020 | 27,671 |
| Athens County | 19 | 14 | Severe Storm | 2020 | 63,218 |
| Brown County | 19 | 13 | Severe Storm | 2020 | 44,292 |
| Clermont County | 19 | 13 | Severe Storm | 2026 | 214,123 |
| Cuyahoga County | 19 | 14 | Severe Storm | 2020 | 1,240,594 |
| Hamilton County | 19 | 14 | Severe Storm | 2026 | 837,359 |
| Lorain County | 19 | 13 | Severe Storm | 2020 | 322,030 |
| Columbiana County | 18 | 13 | Severe Storm | 2020 | 99,823 |
| Harrison County | 18 | 13 | Severe Storm | 2020 | 14,042 |
| Hocking County | 18 | 14 | Severe Storm | 2020 | 27,429 |
| Meigs County | 18 | 14 | Severe Storm | 2020 | 21,491 |
| Morgan County | 18 | 14 | Severe Storm | 2026 | 13,532 |
| Muskingum County | 18 | 13 | Severe Storm | 2026 | 86,582 |
| Noble County | 18 | 13 | Severe Storm | 2020 | 14,269 |
| Richland County | 18 | 11 | Severe Storm | 2024 | 124,853 |
| Scioto County | 18 | 14 | Severe Storm | 2020 | 71,798 |
| Gallia County | 17 | 13 | Severe Storm | 2020 | 28,886 |
| Guernsey County | 17 | 13 | Severe Storm | 2020 | 38,219 |
| Pike County | 17 | 13 | Severe Storm | 2020 | 27,065 |
| Coshocton County | 16 | 11 | Severe Storm | 2020 | 37,003 |
| Greene County | 16 | 9 | Severe Storm | 2020 | 172,347 |
| Jackson County | 16 | 12 | Severe Storm | 2020 | 32,723 |
| Lawrence County | 16 | 12 | Severe Storm | 2020 | 55,829 |
| Lucas County | 16 | 10 | Severe Storm | 2020 | 426,291 |
| Morrow County | 16 | 10 | Severe Storm | 2020 | 35,927 |
| Ross County | 16 | 11 | Severe Storm | 2020 | 76,046 |
| Vinton County | 16 | 12 | Severe Storm | 2020 | 12,545 |
| Ashtabula County | 15 | 8 | Severe Storm | 2020 | 96,906 |
| Crawford County | 15 | 8 | Severe Storm | 2024 | 41,626 |
| Delaware County | 15 | 9 | Severe Storm | 2024 | 237,966 |
| Lake County | 15 | 9 | Flood | 2020 | 232,360 |
| Miami County | 15 | 9 | Severe Storm | 2024 | 111,950 |
| Pickaway County | 15 | 10 | Severe Storm | 2020 | 62,158 |
| Shelby County | 15 | 9 | Severe Storm | 2020 | 47,952 |
| Butler County | 14 | 9 | Severe Storm | 2020 | 399,542 |
| Erie County | 14 | 8 | Severe Storm | 2020 | 73,841 |
| Hancock County | 14 | 9 | Severe Storm | 2024 | 75,016 |
| Huron County | 14 | 6 | Severe Storm | 2020 | 58,168 |
| Logan County | 14 | 9 | Severe Storm | 2024 | 46,085 |
| Medina County | 14 | 9 | Severe Storm | 2020 | 184,625 |
| Mercer County | 14 | 10 | Severe Storm | 2024 | 42,648 |
| Summit County | 14 | 9 | Severe Storm | 2020 | 538,370 |
| Auglaize County | 13 | 9 | Severe Storm | 2024 | 45,922 |
| Darke County | 13 | 7 | Severe Storm | 2024 | 51,462 |
| Fairfield County | 13 | 8 | Severe Storm | 2020 | 167,762 |
| Geauga County | 13 | 7 | Severe Storm | 2020 | 95,362 |
| Knox County | 13 | 7 | Severe Storm | 2020 | 63,848 |
| Montgomery County | 13 | 8 | Severe Storm | 2020 | 537,443 |
| Ottawa County | 13 | 9 | Severe Storm | 2020 | 39,692 |
| Paulding County | 13 | 8 | Severe Storm | 2020 | 18,755 |
| Putnam County | 13 | 8 | Severe Storm | 2020 | 34,206 |
| Sandusky County | 13 | 8 | Severe Storm | 2020 | 58,866 |
| Seneca County | 13 | 7 | Severe Storm | 2020 | 54,730 |
| Tuscarawas County | 13 | 8 | Severe Storm | 2020 | 92,048 |
| Union County | 13 | 7 | Severe Storm | 2024 | 71,721 |
| Van Wert County | 13 | 8 | Severe Storm | 2020 | 28,887 |
| Warren County | 13 | 8 | Severe Storm | 2020 | 256,059 |
| Ashland County | 12 | 6 | Severe Storm | 2020 | 52,420 |
| Hardin County | 12 | 5 | Severe Storm | 2020 | 30,402 |
| Highland County | 12 | 7 | Severe Storm | 2020 | 43,785 |
| Holmes County | 12 | 7 | Severe Storm | 2020 | 44,668 |
| Madison County | 12 | 6 | Severe Storm | 2020 | 45,531 |
| Mahoning County | 12 | 8 | Severe Storm | 2020 | 225,786 |
| Marion County | 12 | 5 | Severe Storm | 2020 | 64,976 |
| Portage County | 12 | 6 | Severe Storm | 2020 | 163,839 |
| Stark County | 12 | 7 | Severe Storm | 2020 | 374,091 |
| Trumbull County | 12 | 7 | Severe Storm | 2020 | 200,300 |
| Wyandot County | 12 | 6 | Severe Storm | 2020 | 21,394 |
| Carroll County | 11 | 6 | Severe Storm | 2020 | 26,460 |
| Champaign County | 11 | 6 | Severe Storm | 2020 | 38,907 |
| Clark County | 11 | 6 | Severe Storm | 2020 | 134,985 |
| Fayette County | 11 | 6 | Severe Storm | 2020 | 28,782 |
| Preble County | 11 | 5 | Severe Storm | 2020 | 40,801 |
| Allen County | 10 | 6 | Severe Storm | 2020 | 100,866 |
| Clinton County | 10 | 4 | Severe Storm | 2020 | 42,019 |
| Henry County | 10 | 5 | Severe Storm | 2020 | 27,536 |
| Wayne County | 10 | 5 | Severe Storm | 2020 | 116,632 |
| Wood County | 10 | 5 | Severe Storm | 2020 | 133,077 |
| Fulton County | 9 | 5 | Severe Storm | 2020 | 42,028 |
| Defiance County | 8 | 3 | Biological | 2020 | 38,644 |
| Williams County | 8 | 4 | Biological | 2020 | 36,554 |