Based on NOAA Storm Events Database records from 1996 to 2025, these are the Washington counties with the most recorded flood events. Okanogan County tops the list with 79 events. The data includes river floods, flash floods, coastal flooding, and hurricane-related flooding.
| Rank | County | Total Events | River Floods | Flash Floods |
|---|---|---|---|---|
| 1 | Okanogan County | 79 | 39 | 40 |
| 2 | Chelan County | 76 | 28 | 48 |
| 3 | Spokane County | 48 | 33 | 15 |
| 4 | Yakima County | 47 | 33 | 14 |
| 5 | Whitman County | 43 | 31 | 12 |
| 6 | Wahkiakum County | 41 | 41 | 0 |
| 7 | Cowlitz County | 27 | 27 | 0 |
| 8 | Ferry County | 25 | 19 | 6 |
| 9 | Stevens County | 23 | 15 | 8 |
| 10 | Kittitas County | 17 | 12 | 5 |
| 11 | Pend Oreille County | 17 | 12 | 5 |
| 12 | Lincoln County | 15 | 8 | 7 |
| 13 | Walla Walla County | 13 | 10 | 3 |
| 14 | Clark County | 12 | 12 | 0 |
| 15 | Pacific County | 12 | 12 | 0 |
| 16 | Snohomish County | 11 | 10 | 1 |
| 17 | Douglas County | 10 | 2 | 8 |
| 18 | Grant County | 10 | 2 | 8 |
| 19 | Skagit County | 10 | 5 | 5 |
| 20 | Asotin County | 9 | 1 | 8 |
| 21 | Grays Harbor County | 9 | 6 | 0 |
| 22 | Benton County | 8 | 6 | 2 |
| 23 | King County | 8 | 7 | 1 |
| 24 | Lewis County | 8 | 8 | 0 |
| 25 | Whatcom County | 7 | 5 | 0 |
| 26 | Clallam County | 6 | 6 | 0 |
| 27 | Adams County | 5 | 4 | 1 |
| 28 | Mason County | 5 | 5 | 0 |
| 29 | Thurston County | 4 | 4 | 0 |
| 30 | Jefferson County | 4 | 4 | 0 |
| 31 | Columbia County | 3 | 1 | 2 |
| 32 | Garfield County | 3 | 1 | 2 |
| 33 | Pierce County | 3 | 3 | 0 |
| 34 | Klickitat County | 3 | 3 | 0 |
| 35 | Franklin County | 2 | 2 | 0 |
| 36 | Island County | 1 | 1 | 0 |
| 37 | Kitsap County | 1 | 1 | 0 |
| 38 | San Juan County | 1 | 1 | 0 |
Source: NOAA Storm Events Database (1996–2025).
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