Table 6. Population Density by County, 2020 and 2025
Summary
Table 6, Population Density, giving each county's land area in square miles, total population for 2020 and 2025, population density for 2020 and 2025, the change in density from 2020 to 2025, and a rank. The state row shows 66,455.1 square miles, a population of 7,706,310 in 2020 and 8,115,100 in 2025, and density rising from 115.96 to 122.11. Clark ranks 2 for density change and Benton 9. The table cites an OFM report of June 27, 2025 as its source.
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“2026 01 28 A33769 D293286 Sb 6149 County Population Density As Calculated By Ofm.”
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Table 6. Population Density
Total Total Population Population Density Density
Land Area Population Population Density Density Change Change
County (sq. mi.) 2020 2025 2020 2025 2020–25 Rank
State 66,455.1 7,706,310 8,115,100 115.96 122.11 6.15 -
Adams 1,925.0 20,613 21,550 10.71 11.19 0.48 30
Asotin 636.1 22,285 22,750 35.04 35.77 0.73 25
Benton 1,700.1 206,873 219,625 121.68 129.18 7.50 9
Chelan 2,921.2 79,141 82,900 27.09 28.38 1.29 20
Clallam 1,738.7 77,155 78,650 44.37 45.23 0.86 24
Clark 628.5 503,311 542,400 800.82 863.02 62.20 2
Columbia 868.6 3,952 3,950 4.55 4.55 0.00 39
Cowlitz 1,141.2 110,730 114,500 97.03 100.34 3.31 13
Douglas 1,819.2 42,938 45,450 23.60 24.98 1.38 19
Ferry 2,203.2 7,178 7,350 3.26 3.34 0.08 37
Franklin 1,241.6 96,749 103,250 77.92 83.16 5.24 11
Garfield 710.8 2,286 2,300 3.22 3.24 0.02 38
Grant 2,679.6 99,123 106,250 36.99 39.65 2.66 15
Grays Harbor 1,901.5 75,636 77,750 39.78 40.89 1.11 21
Island 208.5 86,857 88,700 416.63 425.47 8.84 8
Jefferson 1,803.7 32,977 33,825 18.28 18.75 0.47 31
King 2,115.2 2,269,675 2,411,700 1073.02 1140.16 67.14 1
Kitsap 395.1 275,611 288,900 697.57 731.20 33.63 3
Kittitas 2,297.3 46,468 48,950 20.23 21.31 1.08 22
Klickitat 1,871.6 22,735 23,600 12.15 12.61 0.46 32
Lewis 2,402.8 82,149 85,550 34.19 35.60 1.41 18
Lincoln 2,310.6 10,876 11,250 4.71 4.87 0.16 36
Mason 959.5 65,726 67,800 68.50 70.66 2.16 16
Okanogan 5,266.2 42,104 43,400 8.00 8.24 0.24 35
Pacific 933.6 23,365 23,950 25.03 25.65 0.62 27
Pend Oreille 1,400.2 13,401 13,950 9.57 9.96 0.39 33
Pierce 1,668.0 920,393 959,900 551.81 575.49 23.68 4
San Juan 173.9 17,788 18,550 102.28 106.66 4.38 12
Skagit 1,730.2 129,523 134,600 74.86 77.79 2.93 14
Skamania 1,658.3 11,604 12,150 7.00 7.33 0.33 34
Snohomish 2,086.5 827,957 873,800 396.81 418.78 21.97 5
Spokane 1,764.2 539,339 566,000 305.71 320.82 15.11 7
Stevens 2,477.1 46,445 47,800 18.75 19.30 0.55 28
Thurston 722.5 294,793 309,100 408.02 427.82 19.80 6
Wahkiakum 262.9 4,422 4,550 16.82 17.31 0.49 29
Walla Walla 1270.0 62,584 63,800 49.28 50.23 0.95 23
Whatcom 2,107.9 226,847 240,500 107.62 114.09 6.47 10
Whitman 2,159.3 47,973 49,450 22.22 22.90 0.68 26
Yakima 4,294.5 256,728 264,650 59.78 61.63 1.85 17
Source: OFM report, June 27, 2025
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