# Counties in Washington by median age, 2024

All 39 values come from U.S. Census Bureau for 2024, so the places are comparable.

- Indicator id: `median_age`
- Unit: years
- Definition: Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.
- Source: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population (https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b01002.dat. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/median-age/washington-counties
- CSV: https://invokely.ai/download/rankings/median-age/washington-counties.csv

| Rank | Place | years |
|---:|---|---:|
| 1 | Jefferson County | 59.8 |
| 2 | San Juan County | 57 |
| 3 | Pacific County | 55 |
| 4 | Wahkiakum County | 54.5 |
| 5 | Ferry County | 52.9 |
| 6 | Clallam County | 52.1 |
| 7 | Pend Oreille County | 49.8 |
| 8 | Columbia County | 49.6 |
| 9 | Skamania County | 48.5 |
| 10 | Garfield County | 47.8 |
| 11 | Lincoln County | 46.9 |
| 11 | Stevens County | 46.9 |
| 13 | Klickitat County | 46.8 |
| 14 | Asotin County | 46.2 |
| 15 | Island County | 44.8 |
| 16 | Grays Harbor County | 44.7 |
| 16 | Mason County | 44.7 |
| 18 | Okanogan County | 43.2 |
| 19 | Lewis County | 42.2 |
| 20 | Skagit County | 42.1 |
| 21 | Cowlitz County | 41.5 |
| 22 | Chelan County | 40.4 |
| 23 | Kitsap County | 40.2 |
| 24 | Thurston County | 40 |
| 25 | Clark County | 39.1 |
| 26 | Douglas County | 38.9 |
| 27 | Snohomish County | 38.6 |
| 28 | Spokane County | 38.5 |
| 28 | Walla Walla County | 38.5 |
| 30 | Whatcom County | 38.4 |
| 31 | King County | 37.4 |
| 32 | Pierce County | 37 |
| 33 | Benton County | 36.3 |
| 34 | Kittitas County | 35.8 |
| 35 | Grant County | 33.7 |
| 36 | Yakima County | 33.3 |
| 37 | Franklin County | 30.9 |
| 38 | Adams County | 29.3 |
| 39 | Whitman County | 26.4 |