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County Name	Change (%) Rank	Change (%)	Population 2010	Population 2014	Change (Number)
Franklin	1	12.3%	78,163	87,809	9,646
King	2	7.7%	1,931,249	2,079,967	148,718
Snohomish	3	6.5%	713,335	759,583	46,248
Benton	4	6.5%	175,177	186,486	11,309
Clark	5	6.0%	425,363	451,008	25,645
Thurston	6	5.4%	252,264	265,851	13,587
Pierce	7	4.6%	795,225	831,928	36,703
Whitman	8	4.6%	44,776	46,827	2,051
Grant	9	4.5%	89,120	93,147	4,027
Kittitas	10	3.9%	40,915	42,522	1,607
Whatcom	11	3.6%	201,140	208,351	7,211
Douglas	12	3.6%	38,431	39,804	1,373
Skagit	13	3.0%	116,901	120,365	3,464
Chelan	14	2.9%	72,453	74,588	2,135
Spokane	15	2.8%	471,221	484,318	13,097
Klickitat	16	2.7%	20,318	20,861	543
Asotin	17	2.6%	21,623	22,189	566
Skamania	18	2.5%	11,066	11,340	274
Adams	19	2.4%	18,728	19,179	451
Wahkiakum	20	2.2%	3,978	4,067	89
Clallam	21	1.8%	71,404	72,715	1,311
Yakima	22	1.8%	243,231	247,687	4,456
Walla Walla	23	1.8%	58,781	59,844	1,063
San Juan	24	1.6%	15,769	16,015	246
Ferry	25	1.5%	7,551	7,667	116
Kitsap	26	1.2%	251,133	254,183	3,050
Jefferson	27	1.2%	29,872	30,228	356
Island	28	1.0%	78,506	79,275	769
Okanogan	29	0.4%	41,120	41,290	170
Stevens	30	0.3%	43,531	43,650	119
Mason	31	0.0%	60,699	60,711	12
Pend Oreille	32	-0.1%	13,001	12,985	-16
Cowlitz	33	-0.3%	102,410	102,133	-277
Lewis	34	-0.4%	75,455	75,128	-327
Pacific	35	-1.7%	20,920	20,561	-359
Garfield	36	-2.3%	2,266	2,215	-51
Columbia	37	-2.3%	4,078	3,985	-93
Grays Harbor	38	-2.7%	72,797	70,818	-1,979
Lincoln	39	-3.0%	10,570	10,250	-320