Population - Migration and natural change
(2010 - 2014)
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data: click here.
| County Name | Net Migration (%)
Rank | Net Migration (%) | Net Migration (Number) | Natural change (%) | Natural change (Number) |
| Franklin | 1 | 5.1% | 3,968 | 7.1% | 5,523 |
| King | 2 | 5.0% | 95,774 | 2.8% | 53,738 |
| Wahkiakum | 3 | 4.0% | 161 | -1.7% | -69 |
| Snohomish | 4 | 3.8% | 27,172 | 2.6% | 18,646 |
| Clark | 5 | 3.5% | 15,023 | 2.4% | 10,067 |
| Thurston | 6 | 3.5% | 8,739 | 1.9% | 4,814 |
| Jefferson | 7 | 3.2% | 963 | -2.1% | -614 |
| Clallam | 8 | 3.2% | 2,270 | -1.6% | -1,108 |
| Benton | 9 | 3.2% | 5,559 | 3.2% | 5,558 |
| San Juan | 10 | 2.8% | 435 | -1.2% | -182 |
| Kittitas | 11 | 2.7% | 1,089 | 1.3% | 534 |
| Whitman | 12 | 2.6% | 1,147 | 2.0% | 875 |
| Asotin | 13 | 2.4% | 528 | 0.2% | 35 |
| Ferry | 14 | 2.4% | 183 | -0.9% | -69 |
| Klickitat | 15 | 2.2% | 448 | 0.6% | 115 |
| Whatcom | 16 | 2.0% | 3,992 | 1.6% | 3,259 |
| Skamania | 17 | 1.8% | 196 | 1.0% | 116 |
| Pierce | 18 | 1.8% | 14,072 | 2.8% | 22,190 |
| Skagit | 19 | 1.6% | 1,856 | 1.2% | 1,461 |
| Douglas | 20 | 1.2% | 470 | 2.4% | 909 |
| Chelan | 21 | 1.2% | 853 | 1.7% | 1,246 |
| Spokane | 22 | 1.1% | 5,235 | 1.6% | 7,697 |
| Pend Oreille | 23 | 1.0% | 128 | -0.9% | -121 |
| Walla Walla | 24 | 0.7% | 400 | 1.0% | 610 |
| Pacific | 25 | 0.4% | 88 | -2.0% | -426 |
| Grant | 26 | 0.4% | 360 | 4.3% | 3,850 |
| Stevens | 27 | 0.3% | 113 | 0.2% | 73 |
| Mason | 28 | 0.1% | 63 | 0.1% | 85 |
| Garfield | 29 | -0.1% | -2 | -1.9% | -42 |
| Kitsap | 30 | -0.5% | -1,158 | 1.6% | 3,920 |
| Island | 31 | -0.6% | -434 | 1.4% | 1,094 |
| Okanogan | 32 | -0.8% | -309 | 1.3% | 530 |
| Cowlitz | 33 | -0.8% | -848 | 0.6% | 589 |
| Lewis | 34 | -0.9% | -656 | 0.4% | 286 |
| Columbia | 35 | -1.0% | -40 | -1.3% | -53 |
| Lincoln | 36 | -2.0% | -211 | -0.8% | -81 |
| Yakima | 37 | -2.1% | -5,114 | 4.0% | 9,644 |
| Grays Harbor | 38 | -2.6% | -1,867 | 0.0% | 7 |
| Adams | 39 | -4.1% | -773 | 6.6% | 1,230 |
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