| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Crook County | 1 | 12.67% | 28,088 | 24,930 |
| Sherman County | 2 | 12.01% | 2,098 | 1,873 |
| Deschutes County | 3 | 8.73% | 216,891 | 199,470 |
| Benton County | 4 | 6.36% | 99,565 | 93,615 |
| Yamhill County | 5 | 6.15% | 114,366 | 107,740 |
| Jefferson County | 6 | 4.35% | 25,648 | 24,578 |
| Linn County | 7 | 4.22% | 134,404 | 128,967 |
| Washington County | 8 | 3.84% | 624,154 | 601,045 |
| Marion County | 9 | 3.62% | 358,853 | 346,305 |
| Polk County | 10 | 3.48% | 91,067 | 88,003 |
| Columbia County | 11 | 3.11% | 54,353 | 52,716 |
| Wheeler County | 12 | 2.54% | 1,496 | 1,459 |
| Malheur County | 13 | 2.46% | 32,421 | 31,643 |
| Umatilla County | 14 | 2.3% | 81,729 | 79,893 |
| Morrow County | 15 | 2.08% | 12,474 | 12,220 |
| Clackamas County | 16 | 1.48% | 428,779 | 422,512 |
| Klamath County | 17 | 1.42% | 70,620 | 69,631 |
| Lincoln County | 18 | 1% | 51,022 | 50,517 |
| Josephine County | 19 | 0.68% | 88,826 | 88,228 |
| Douglas County | 20 | 0.54% | 111,895 | 111,292 |
| Wasco County | 21 | 0.4% | 26,717 | 26,610 |
| Union County | 22 | -0.27% | 26,098 | 26,168 |
| Lane County | 23 | -0.35% | 382,886 | 384,221 |
| Clatsop County | 24 | -0.5% | 40,951 | 41,157 |
| Hood River County | 25 | -0.95% | 23,670 | 23,897 |
| Jackson County | 26 | -1.09% | 221,317 | 223,755 |
| Wallowa County | 27 | -1.62% | 7,280 | 7,400 |
| Coos County | 28 | -1.71% | 63,864 | 64,976 |
| Baker County | 29 | -1.73% | 16,442 | 16,731 |
| Tillamook County | 30 | -1.88% | 26,946 | 27,462 |
| Multnomah County | 31 | -2.1% | 799,149 | 816,321 |
| Lake County | 32 | -2.52% | 7,968 | 8,174 |
| Harney County | 33 | -2.67% | 7,304 | 7,504 |
| Grant County | 34 | -5.34% | 6,847 | 7,233 |
| Curry County | 35 | -7.41% | 21,776 | 23,518 |
| Gilliam County | 36 | -8.54% | 1,843 | 2,015 |
Oregon's counties show varied growth patterns from 2020 to 2026. Crook County leads with 2.01% annualized growth, followed by Sherman County (1.91%) and Deschutes County (1.41%). The largest counties are Multnomah County (799,149), Washington County (624,154), and Clackamas County (428,779). Of the 36 counties in Oregon, 21 are growing while 15 have experienced population decline. Overall, counties averaged 0.19% annualized growth, with total population growing by 0.26% annually.
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