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County Name	Under 18 Rank	Under 18	18-64	65 and over
Pend Oreille	1	33.1%	21.3%	10.6%
Okanogan	2	31.5%	20.9%	9.7%
Yakima	3	30.3%	19.9%	10.2%
Ferry	4	29.1%	25.8%	6.4%
Pacific	5	28.8%	17.9%	8.9%
Grays Harbor	6	28.6%	19.0%	8.3%
Stevens	7	28.2%	16.5%	8.0%
Adams	8	27.1%	18.9%	15.0%
Cowlitz	9	26.8%	17.2%	7.8%
Wahkiakum	10	26.7%	23.8%	8.7%
Clallam	11	26.2%	16.3%	6.9%
Columbia	12	25.7%	16.7%	11.2%
Franklin	13	24.9%	16.5%	11.3%
Jefferson	14	24.5%	14.8%	7.3%
Lewis	15	24.5%	16.0%	7.1%
Douglas	16	24.4%	14.2%	5.8%
Asotin	17	24.2%	14.1%	10.2%
Mason	18	23.6%	17.5%	5.4%
Skagit	19	23.2%	13.2%	7.1%
Klickitat	20	22.6%	16.7%	4.0%
Benton	21	21.3%	11.1%	6.9%
Grant	22	20.9%	18.6%	10.5%
Walla Walla	23	20.8%	16.9%	7.9%
Garfield	24	20.7%	12.1%	2.7%
Spokane	25	20.5%	15.8%	8.2%
Chelan	26	20.2%	12.0%	11.8%
Skamania	27	20.1%	14.0%	9.0%
San Juan	28	19.6%	12.0%	4.4%
Kittitas	29	18.7%	26.5%	6.5%
Lincoln	30	17.7%	14.6%	6.6%
Whatcom	31	17.7%	18.2%	6.8%
Pierce	32	17.5%	11.7%	7.4%
Whitman	33	16.7%	39.1%	7.2%
Thurston	34	15.6%	11.5%	6.9%
Island	35	15.4%	9.6%	3.3%
Kitsap	36	14.4%	10.2%	7.0%
King	37	13.6%	10.9%	9.3%
Clark	38	13.6%	11.6%	7.4%
Snohomish	39	13.1%	9.7%	7.1%