Oregon counties ranked by the diversity index, the chance that two public school students picked at random from the county belong to different racial or ethnic groups. Counties need at least 3 schools and 1,000 students to qualify. The median ranked county is at 49.2%.
| # | County | State | Diversity index |
|---|---|---|---|
| 1 | Multnomah County | OR | 70.4% |
| 2 | Washington County | OR | 68.6% |
| 3 | Jefferson County | OR | 68.2% |
| 4 | Marion County | OR | 60.3% |
| 5 | Umatilla County | OR | 58.2% |
| 6 | Wasco County | OR | 58.1% |
| 7 | Lincoln County | OR | 57.2% |
| 8 | Hood River County | OR | 56.1% |
| 9 | Klamath County | OR | 55.7% |
| 10 | Polk County | OR | 55.4% |
| 11 | Clackamas County | OR | 54.1% |
| 12 | Malheur County | OR | 54.0% |
| 13 | Yamhill County | OR | 52.7% |
| 14 | Jackson County | OR | 51.0% |
| 15 | Morrow County | OR | 50.9% |
| 16 | Curry County | OR | 50.0% |
| 17 | Tillamook County | OR | 49.2% |
| 18 | Benton County | OR | 49.1% |
| 19 | Lane County | OR | 49.1% |
| 20 | Clatsop County | OR | 47.3% |
| 21 | Linn County | OR | 44.6% |
| 22 | Crook County | OR | 44.3% |
| 23 | Coos County | OR | 43.2% |
| 24 | Josephine County | OR | 40.7% |
| 25 | Grant County | OR | 40.1% |
| 26 | Lake County | OR | 39.6% |
| 27 | Deschutes County | OR | 38.1% |
| 28 | Columbia County | OR | 36.5% |
| 29 | Harney County | OR | 35.8% |
| 30 | Douglas County | OR | 35.7% |
| 31 | Baker County | OR | 35.0% |
| 32 | Union County | OR | 31.0% |
| 33 | Wheeler County | OR | 19.2% |