Maryland coastal flooding risk
Somerset County has the highest coastal flooding risk in Maryland, scoring 93.2 out of 100 — rated "Relatively High" by FEMA's National Risk Index.
| # | County | NRI score | Rating |
|---|---|---|---|
| 1 | Somerset County | 93.2 | Relatively High |
| 2 | Dorchester County | 91.2 | Relatively High |
| 3 | Worcester County | 88 | Relatively High |
| 4 | Baltimore County | 73.8 | Relatively Moderate |
| 5 | Anne Arundel County | 73.2 | Relatively Moderate |
| 6 | Talbot County | 70.6 | Relatively Moderate |
| 7 | Queen Anne's County | 67.2 | Relatively Moderate |
| 8 | Baltimore | 64 | Relatively Moderate |
| 9 | St. Mary's County | 63 | Relatively Moderate |
| 10 | Kent County | 60 | Relatively Low |
| 11 | Calvert County | 59.4 | Relatively Low |
| 12 | Wicomico County | 57.8 | Relatively Low |
| 13 | Cecil County | 56.6 | Relatively Low |
| 14 | Caroline County | 53.4 | Relatively Low |
| 15 | Charles County | 52.4 | Relatively Low |
| 16 | Prince George's County | 49.4 | Relatively Low |
| 17 | Harford County | 47.8 | Relatively Low |
| 18 | Howard County | 20.4 | Very Low |
| 19 | Montgomery County | 19.6 | 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 Maryland:
Frequently asked questions
What is the highest coastal flooding risk county in Maryland?
Somerset County, MD has the highest coastal flooding risk in Maryland, with a FEMA National Risk Index score of 93.2 out of 100 (rated "Relatively High").
What causes coastal flooding risk in Maryland?
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.