Based on NOAA Storm Events Database records from 1996 to 2025, these are the Maryland counties with the most recorded flood events. Baltimore County tops the list with 513 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.
| Rank | County | Total Events | River Floods | Flash Floods |
|---|---|---|---|---|
| 1 | Baltimore County | 513 | 174 | 314 |
| 2 | Montgomery County | 429 | 186 | 242 |
| 3 | Frederick County | 313 | 219 | 92 |
| 4 | Anne Arundel County | 266 | 91 | 86 |
| 5 | St. Mary's County | 248 | 86 | 72 |
| 6 | Harford County | 231 | 79 | 146 |
| 7 | Prince George's County | 224 | 103 | 117 |
| 8 | Howard County | 163 | 71 | 90 |
| 9 | Carroll County | 150 | 80 | 69 |
| 10 | Washington County | 118 | 73 | 45 |
| 11 | Allegany County | 109 | 48 | 61 |
| 12 | Cecil County | 106 | 43 | 56 |
| 13 | Charles County | 96 | 45 | 39 |
| 14 | Dorchester County | 95 | 8 | 24 |
| 15 | Baltimore city | 94 | 15 | 56 |
| 16 | Garrett County | 92 | 41 | 51 |
| 17 | Worcester County | 76 | 14 | 24 |
| 18 | Calvert County | 71 | 28 | 23 |
| 19 | Queen Anne's County | 57 | 10 | 32 |
| 20 | Wicomico County | 50 | 9 | 21 |
| 21 | Somerset County | 49 | 7 | 10 |
| 22 | Talbot County | 41 | 3 | 23 |
| 23 | Caroline County | 40 | 8 | 19 |
| 24 | Kent County | 37 | 3 | 21 |
Source: NOAA Storm Events Database (1996–2025).
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