To resort data: click column headings. To download data: click here.

County Name	Median age Rank	Median age
Jefferson	1	56.5
San Juan	2	55.2
Wahkiakum	3	53.8
Pacific	4	52.4
Clallam	5	50.3
Columbia	6	50.3
Garfield	7	49.8
Pend Oreille	8	49.8
Lincoln	9	48.6
Ferry	10	48.6
Stevens	11	46.5
Klickitat	12	46.4
Mason	13	45.6
Skamania	14	45.5
Island	15	44.5
Asotin	16	44.3
Grays Harbor	17	43.2
Okanogan	18	43.2
Lewis	19	43.0
Cowlitz	20	41.8
Skagit	21	41.3
Kitsap	22	39.7
Chelan	23	39.6
Thurston	24	38.6
Douglas	25	37.8
Clark	26	37.8
Snohomish	27	37.8
Spokane	28	37.3
King	29	37.2
Walla Walla	30	36.9
Whatcom	31	36.7
Pierce	32	35.9
Benton	33	35.7
Kittitas	34	32.7
Yakima	35	32.7
Grant	36	32.5
Franklin	37	29.4
Adams	38	28.6
Whitman	39	24.4