| # | County | Risk Index score |
|---|---|---|
| 1 | Franklin County | 98.1 |
| 2 | Cuyahoga County | 98.0 |
| 3 | Hamilton County | 96.3 |
| 4 | Montgomery County | 92.7 |
| 5 | Lucas County | 92.4 |
| 6 | Butler County | 91.5 |
| 7 | Summit County | 91.2 |
| 8 | Stark County | 87.9 |
| 9 | Lorain County | 86.3 |
| 10 | Trumbull County | 84.5 |
| 11 | Mahoning County | 83.6 |
| 12 | Licking County | 78.9 |
| 13 | Delaware County | 78.8 |
| 14 | Clermont County | 77.9 |
| 15 | Warren County | 77.8 |
| 16 | Lake County | 77.4 |
| 17 | Clark County | 77.1 |
| 18 | Greene County | 75.7 |
| 19 | Belmont County | 75.2 |
| 20 | Allen County | 73.3 |
| 21 | Fairfield County | 72.6 |
| 22 | Lawrence County | 71.0 |
| 23 | Muskingum County | 70.9 |
| 24 | Scioto County | 70.2 |
| 25 | Columbiana County | 69.1 |
Source: FEMA National Risk Index (December 2025). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties with the Highest Natural Hazard Risk in Ohio”, https://gismap.land/rankings/ohio/highest-risk-counties. Figures from FEMA National Risk Index (December 2025).
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