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County Name	Under 18 Rank	Under 18	18 - 64	65 and over	Dependency ratio
Adams	1	35.3%	54.5%	10.2%	83.4
Franklin	2	33.5%	58.6%	7.9%	70.6
Grant	3	30.2%	57.2%	12.6%	74.9
Yakima	4	29.8%	57.4%	12.8%	74.3
Benton	5	26.7%	59.9%	13.4%	66.8
Douglas	6	26.2%	57.9%	15.9%	72.7
Clark	7	25.2%	61.0%	13.8%	63.9
Chelan	8	24.2%	58.3%	17.5%	71.5
Pierce	9	24.0%	63.3%	12.7%	58.0
Okanogan	10	23.4%	56.8%	19.8%	76.1
Snohomish	11	23.2%	64.7%	12.1%	54.5
Cowlitz	12	22.9%	58.9%	18.1%	69.7
Skagit	13	22.5%	58.7%	18.7%	70.2
Spokane	14	22.5%	62.8%	14.8%	59.3
Stevens	15	22.1%	57.2%	20.7%	74.9
Thurston	16	22.1%	62.7%	15.2%	59.6
Lewis	17	21.9%	58.3%	19.8%	71.6
Walla Walla	18	21.7%	61.7%	16.5%	62.0
Lincoln	19	21.7%	54.4%	23.9%	83.8
Grays Harbor	20	21.1%	60.0%	18.9%	66.7
Asotin	21	21.0%	58.1%	20.9%	72.0
King	22	21.0%	66.9%	12.2%	49.6
Kitsap	23	20.9%	63.1%	16.1%	58.5
Skamania	24	20.8%	61.8%	17.4%	61.8
Klickitat	25	20.5%	58.4%	21.1%	71.2
Whatcom	26	20.2%	64.4%	15.4%	55.4
Pend Oreille	27	20.0%	56.8%	23.1%	75.9
Garfield	28	19.9%	55.6%	24.6%	79.9
Mason	29	19.3%	59.4%	21.3%	68.3
Columbia	30	19.0%	54.3%	26.6%	84.1
Island	31	18.9%	58.7%	22.5%	70.4
Ferry	32	18.6%	59.2%	22.3%	69.0
Kittitas	33	18.1%	67.3%	14.6%	48.6
Clallam	34	17.7%	55.5%	26.9%	80.3
Wahkiakum	35	17.3%	52.0%	30.7%	92.5
Pacific	36	17.0%	55.2%	27.9%	81.3
Whitman	37	15.2%	74.8%	10.0%	33.7
San Juan	38	14.1%	56.5%	29.4%	77.1
Jefferson	39	13.4%	54.8%	31.8%	82.5