| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Crook County | 1 | 11.53% | 27,808 | 24,933 |
| Sherman County | 2 | 11.01% | 2,087 | 1,880 |
| Deschutes County | 3 | 7.76% | 214,942 | 199,461 |
| Jefferson County | 4 | 4.93% | 25,795 | 24,582 |
| Benton County | 5 | 4.56% | 97,866 | 93,602 |
| Morrow County | 6 | 4.35% | 12,750 | 12,219 |
| Marion County | 7 | 3.48% | 358,336 | 346,284 |
| Linn County | 8 | 3.22% | 133,102 | 128,950 |
| Columbia County | 9 | 2.85% | 54,217 | 52,715 |
| Wallowa County | 10 | 2.55% | 7,592 | 7,403 |
| Washington County | 11 | 2.3% | 614,803 | 601,004 |
| Polk County | 12 | 2.14% | 89,869 | 87,983 |
| Yamhill County | 13 | 2.13% | 109,983 | 107,692 |
| Wheeler County | 14 | 2.05% | 1,490 | 1,460 |
| Umatilla County | 15 | 1.74% | 81,280 | 79,892 |
| Malheur County | 16 | 1.58% | 32,151 | 31,650 |
| Clackamas County | 17 | 1.14% | 427,315 | 422,483 |
| Klamath County | 18 | 0.79% | 70,177 | 69,624 |
| Lake County | 19 | 0.45% | 8,207 | 8,170 |
| Douglas County | 20 | 0.23% | 111,551 | 111,294 |
| Lincoln County | 21 | 0.02% | 50,519 | 50,509 |
| Tillamook County | 22 | -0.4% | 27,346 | 27,456 |
| Jackson County | 23 | -0.67% | 222,243 | 223,753 |
| Josephine County | 24 | -0.71% | 87,591 | 88,214 |
| Hood River County | 25 | -0.8% | 23,707 | 23,898 |
| Lane County | 26 | -0.82% | 381,087 | 384,242 |
| Baker County | 27 | -1.01% | 16,559 | 16,728 |
| Union County | 28 | -1.21% | 25,855 | 26,171 |
| Clatsop County | 29 | -1.24% | 40,646 | 41,156 |
| Wasco County | 30 | -1.71% | 26,159 | 26,613 |
| Coos County | 31 | -1.91% | 63,742 | 64,982 |
| Harney County | 32 | -2.26% | 7,337 | 7,507 |
| Multnomah County | 33 | -2.44% | 796,310 | 816,261 |
| Grant County | 34 | -2.68% | 7,046 | 7,240 |
| Gilliam County | 35 | -2.78% | 1,958 | 2,014 |
| Curry County | 36 | -4.66% | 22,422 | 23,519 |
Oregon's counties show varied growth patterns from 2020 to 2026. Crook County leads with 1.84% annualized growth, followed by Sherman County (1.76%) and Deschutes County (1.25%). The largest counties are Multnomah County (796,310), Washington County (614,803), and Clackamas County (427,315). Of the 36 counties in Oregon, 21 are growing while 15 have experienced population decline. Overall, counties averaged 0.2% annualized growth, with total population growing by 0.15% annually.
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