Largest Counties in Oregon

Rank County Population County Seat Established Area (km2) Density
1 Multnomah County 790,659 Portland 1854 1,127 701.56
2 Washington County 583,584 Hillsboro 1843 1,875 311.24
3 Clackamas County 404,969 Oregon City 1843 4,838 83.71
4 Lane County 365,929 Eugene 1851 11,795 31.02
5 Marion County 333,939 Salem 1843 3,069 108.81
6 Jackson County 213,754 Medford 1852 7,213 29.63
7 Deschutes County 176,624 Bend 1916 7,817 22.59
8 Linn County 122,304 Albany 1847 5,934 20.61
9 Douglas County 110,384 Roseburg 1852 13,046 8.46
10 Yamhill County 104,979 McMinnville 1843 1,854 56.62
11 Benton County 91,309 Corvallis 1847 1,751 52.15
12 Josephine County 84,664 Grants Pass 1856 4,248 19.93
13 Umatilla County 79,869 Pendleton 1862 8,327 9.59
14 Polk County 79,719 Dallas 1845 1,919 41.54
15 Klamath County 67,399 Klamath Falls 1882 15,397 4.38
16 Coos County 63,179 Coquille 1853 4,144 15.25
17 Columbia County 50,784 Saint Helens 1854 1,702 29.84
18 Lincoln County 47,724 Newport 1893 2,538 18.8
19 Clatsop County 38,214 Astoria 1844 2,142 17.84
20 Malheur County 31,694 Vale 1887 25,610 1.24
21 Union County 26,734 La Grande 1864 5,276 5.07
22 Wasco County 26,689 The Dalles 1854 6,167 4.33
23 Tillamook County 25,909 Tillamook 1853 2,854 9.08
24 Hood River County 24,724 Hood River 1908 1,352 18.29
25 Jefferson County 22,779 Madras 1914 4,613 4.94
26 Curry County 22,589 Gold Beach 1855 4,214 5.36
27 Crook County 21,569 Prineville 1882 7,718 2.79
28 Baker County 16,499 Baker City 1862 7,946 2.08
29 Morrow County 11,734 Heppner 1885 5,265 2.23
30 Lake County 8,004 Lakeview 1874 20,565 0.39
31 Grant County 7,399 Canyon City 1864 11,730 0.63
32 Harney County 7,309 Burns 1889 26,250 0.28
33 Wallowa County 7,129 Enterprise 1887 8,146 0.88
34 Gilliam County 1,969 Condon 1885 3,118 0.63
35 Sherman County 1,784 Moro 1889 2,132 0.84
36 Wheeler County 1,454 Fossil 1899 4,442 0.33

Largest Counties in Oregon

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