Maryland inland flooding risk
Prince George's County has the highest inland flooding risk in Maryland, scoring 94.6 out of 100 — rated "Relatively High" by FEMA's National Risk Index. Recorded inland flooding events across Maryland have decreased 37% over the past five years compared to the prior five-year period.
| # | County | NRI score | Rating |
NOAA events 2016–2026 |
|---|---|---|---|---|
| 1 | Prince George's County | 94.6 | Relatively High | 114 |
| 2 | Baltimore | 94.3 | Relatively High | 19 |
| 3 | Baltimore County | 93.9 | Relatively High | 266 |
| 4 | Montgomery County | 93.7 | Relatively High | 296 |
| 5 | Frederick County | 81.6 | Relatively Moderate | 183 |
| 6 | Anne Arundel County | 80.9 | Relatively Moderate | 76 |
| 7 | Harford County | 78.4 | Relatively Moderate | 157 |
| 8 | Howard County | 78.1 | Relatively Moderate | 81 |
| 9 | Allegany County | 73.6 | Relatively Moderate | 62 |
| 10 | Washington County | 73.1 | Relatively Moderate | 66 |
| 11 | Carroll County | 66.7 | Relatively Low | 82 |
| 12 | Cecil County | 60.8 | Relatively Low | 36 |
| 13 | Charles County | 50.6 | Relatively Low | 53 |
| 14 | Worcester County | 50.1 | Relatively Low | 24 |
| 15 | Wicomico County | 44.2 | Relatively Low | 21 |
| 16 | St. Mary's County | 36.8 | Relatively Low | 113 |
| 17 | Garrett County | 34.7 | Very Low | 38 |
| 18 | Queen Anne's County | 34.2 | Very Low | 19 |
| 19 | Calvert County | 28.9 | Very Low | 27 |
| 20 | Talbot County | 28 | Very Low | 9 |
| 21 | Caroline County | 26.6 | Very Low | 6 |
| 22 | Somerset County | 24.3 | Very Low | 14 |
| 23 | Dorchester County | 21.6 | Very Low | 18 |
| 24 | Kent County | 16.3 | Very Low | 5 |
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.
Inland Flooding risk nationally:
Other hazard risks in Maryland:
Frequently asked questions
What is the highest inland flooding risk county in Maryland?
Prince George's County, MD has the highest inland flooding risk in Maryland, with a FEMA National Risk Index score of 94.6 out of 100 (rated "Relatively High").
What causes inland flooding risk in Maryland?
Inland flooding covers riverine and surface (pluvial) flooding — the most common and costly natural disaster type in the US. High scores appear across river floodplains in the Midwest, South, and Mid-Atlantic, where legacy development in flood-prone areas and aging stormwater infrastructure concentrate risk.