| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Crook County | 1 | 11.16% | 27,712 | 24,930 |
| Sherman County | 2 | 9.45% | 2,050 | 1,873 |
| Deschutes County | 3 | 7.39% | 214,213 | 199,470 |
| Benton County | 4 | 6% | 99,232 | 93,615 |
| Yamhill County | 5 | 4.53% | 112,626 | 107,740 |
| Jefferson County | 6 | 4.13% | 25,592 | 24,578 |
| Linn County | 7 | 3.47% | 133,439 | 128,967 |
| Polk County | 8 | 3.19% | 90,808 | 88,003 |
| Columbia County | 9 | 2.83% | 54,208 | 52,716 |
| Washington County | 10 | 2.77% | 617,713 | 601,045 |
| Marion County | 11 | 2.76% | 355,860 | 346,305 |
| Malheur County | 12 | 2.29% | 32,368 | 31,643 |
| Morrow County | 13 | 1.61% | 12,417 | 12,220 |
| Umatilla County | 14 | 1.52% | 81,110 | 79,893 |
| Klamath County | 15 | 1.29% | 70,529 | 69,631 |
| Lincoln County | 16 | 1.19% | 51,117 | 50,517 |
| Wheeler County | 17 | 1.17% | 1,476 | 1,459 |
| Clackamas County | 18 | 1.14% | 427,318 | 422,512 |
| Douglas County | 19 | 0.7% | 112,075 | 111,292 |
| Josephine County | 20 | 0.37% | 88,551 | 88,228 |
| Wallowa County | 21 | 0.01% | 7,401 | 7,400 |
| Wasco County | 22 | 0.01% | 26,612 | 26,610 |
| Union County | 23 | -0.34% | 26,078 | 26,168 |
| Clatsop County | 24 | -0.39% | 40,997 | 41,157 |
| Lane County | 25 | -0.41% | 382,641 | 384,221 |
| Hood River County | 26 | -0.75% | 23,717 | 23,897 |
| Baker County | 27 | -0.81% | 16,596 | 16,731 |
| Jackson County | 28 | -1.09% | 221,324 | 223,755 |
| Lake County | 29 | -1.14% | 8,081 | 8,174 |
| Tillamook County | 30 | -1.3% | 27,105 | 27,462 |
| Coos County | 31 | -1.36% | 64,095 | 64,976 |
| Harney County | 32 | -2.01% | 7,353 | 7,504 |
| Multnomah County | 33 | -2.3% | 797,523 | 816,321 |
| Grant County | 34 | -3.64% | 6,970 | 7,233 |
| Curry County | 35 | -5.29% | 22,275 | 23,518 |
| Gilliam County | 36 | -5.36% | 1,907 | 2,015 |
Oregon's counties show varied growth patterns from 2020 to 2025. Crook County leads with 11.16% annualized growth, followed by Sherman County (9.45%) and Deschutes County (7.39%). The largest counties are Multnomah County (797,523), Washington County (617,713), and Clackamas County (427,318). Of the 36 counties in Oregon, 22 are growing while 14 have experienced population decline. Overall, counties averaged 1.19% annualized growth, with total population growing by 1.11% annually.
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