Based on NOAA Storm Events Database records from 1996 to 2025, these are the Massachusetts counties with the most recorded flood events. Norfolk County tops the list with 319 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.
| Rank | County | Total Events | River Floods | Flash Floods |
|---|---|---|---|---|
| 1 | Norfolk County | 319 | 105 | 51 |
| 2 | Middlesex County | 264 | 183 | 75 |
| 3 | Worcester County | 219 | 135 | 78 |
| 4 | Bristol County | 202 | 116 | 60 |
| 5 | Essex County | 202 | 91 | 55 |
| 6 | Plymouth County | 169 | 63 | 22 |
| 7 | Berkshire County | 157 | 45 | 108 |
| 8 | Hampden County | 133 | 90 | 39 |
| 9 | Suffolk County | 126 | 41 | 31 |
| 10 | Barnstable County | 113 | 36 | 18 |
| 11 | Franklin County | 93 | 52 | 38 |
| 12 | Hampshire County | 73 | 39 | 30 |
| 13 | Nantucket County | 45 | 8 | 0 |
| 14 | Dukes County | 36 | 9 | 0 |
Source: NOAA Storm Events Database (1996–2025).
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