Oregon Gazetteer
The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
| County | Diversity Index | |
|---|---|---|
| 1. | Morrow County | 77.8 |
| 2. | Malheur County | 72.9 |
| 3. | Umatilla County | 72.6 |
| 4. | Marion County | 72.1 |
| 5. | Hood River County | 71.9 |
| 6. | Jefferson County | 70.1 |
| 7. | Washington County | 70.0 |
| 8. | Multnomah County | 63.6 |
| 9. | Wasco County | 61.9 |
| 10. | Yamhill County | 56.9 |
| 11. | Polk County | 54.8 |
| 12. | Klamath County | 52.5 |
| 13. | Jackson County | 51.9 |
| 14. | Benton County | 49.1 |
| 15. | Clackamas County | 48.5 |
| 16. | Lane County | 47.0 |
| 17. | Lincoln County | 47.0 |
| 18. | Tillamook County | 45.7 |
| 19. | Lake County | 45.3 |
| 20. | Linn County | 43.1 |
