Mississippi coastal flooding risk
Harrison County has the highest coastal flooding risk in Mississippi, scoring 91.6 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Harrison County | 91.6 | Relatively High |
| 2 | Hancock County | 86.2 | Relatively High |
| 3 | Jackson County | 84.8 | Relatively High |
| 4 | Pearl River County | 30.4 | Very Low |
| 5 | George County | 16.8 | Very Low |
Source: FEMA National Risk Index v1.20.0, December 2025. Scores are 0–100 percentile rankings among all US counties. See the methodology page for definitions. Download the full CSV for all counties.
Coastal Flooding risk nationally:
Other hazard risks in Mississippi:
Frequently asked questions
What is the highest coastal flooding risk county in Mississippi?
Harrison County, MS has the highest coastal flooding risk in Mississippi, with a FEMA National Risk Index score of 91.6 out of 100 (rated "Relatively High").
What causes coastal flooding risk in Mississippi?
Coastal flooding scores cover storm surge, wave action, and tidal flooding along the Gulf, Atlantic, and Pacific coasts, and Great Lakes shoreline. Inland flooding is scored separately. Counties with "Not Applicable" ratings have no significant coastal exposure. Coastal flood events are reported at zone level in NOAA Storm Events and are not included in county-level counts.