This is a two percent rise in Kittitas County’s population, from 44,589 in 2020 to 45,499 in 2021.
Kittitas County had the 24th largest population in Washington in 2021.
The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.
The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.
The US population continues to grow, though at a slower rate than before.
Washington Counties By Population Change from 2020 to 2021
| County | 2020 Estimated Population | 2021 Estimated Population | % Change in Population From Year to Year |
|---|---|---|---|
| San Juan County | 17,818 | 18,557 | 4.1% |
| Wahkiakum County | 4,443 | 4,582 | 3.1% |
| Pend Oreille County | 13,482 | 13,886 | 3% |
| Lincoln County | 10,920 | 11,232 | 2.9% |
| Mason County | 66,028 | 67,615 | 2.4% |
| Garfield County | 2,292 | 2,346 | 2.4% |
| Columbia County | 3,949 | 4,042 | 2.4% |
| Lewis County | 82,474 | 84,398 | 2.3% |
| Kittitas County | 44,589 | 45,499 | 2% |
| Pacific County | 23,470 | 23,948 | 2% |
| Stevens County | 46,566 | 47,426 | 1.8% |
| Jefferson County | 33,048 | 33,605 | 1.7% |
| Douglas County | 42,998 | 43,696 | 1.6% |
| Klickitat County | 22,783 | 23,118 | 1.5% |
| Grays Harbor County | 75,811 | 76,841 | 1.4% |
| Benton County | 207,230 | 210,025 | 1.3% |
| Ferry County | 7,178 | 7,273 | 1.3% |
| Clark County | 505,013 | 511,404 | 1.3% |
| Franklin County | 97,076 | 98,268 | 1.2% |
| Okanogan County | 42,118 | 42,634 | 1.2% |
| Clallam County | 77,280 | 78,209 | 1.2% |
| Skamania County | 12,034 | 12,170 | 1.1% |
| Spokane County | 540,700 | 546,040 | 1% |
| Grant County | 99,365 | 100,297 | 0.9% |
| Thurston County | 295,729 | 297,977 | 0.8% |
| Whatcom County | 227,304 | 228,831 | 0.7% |
| Skagit County | 129,852 | 130,696 | 0.6% |
| Chelan County | 79,185 | 79,646 | 0.6% |
| Island County | 86,948 | 87,432 | 0.6% |
| Cowlitz County | 110,924 | 111,524 | 0.5% |
| Snohomish County | 829,331 | 833,540 | 0.5% |
| Asotin County | 22,290 | 22,397 | 0.5% |
| Pierce County | 922,828 | 925,708 | 0.3% |
| Whitman County | 47,786 | 47,873 | 0.2% |
| Walla Walla County | 62,574 | 62,682 | 0.2% |
| Adams County | 20,605 | 20,621 | 0.1% |
| Yakima County | 256,533 | 256,035 | -0.2% |
| Kitsap County | 275,660 | 274,314 | -0.5% |
| King County | 2,272,571 | 2,252,305 | -0.9% |
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