There were 739 more people living in San Juan County in 2021 compared to 2020, according to population estimates from the US Census Bureau.
This is a 4.1 percent rise in San Juan County’s population, from 17,818 in 2020 to 18,557 in 2021.
San Juan County had the 32nd 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% |
