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.
| Name | County | Diversity Index | |
|---|---|---|---|
| 1. | Cascadia Census Designated Place | Linn | 17.7 |
| 2. | City of Mitchell | Wheeler | 18.8 |
| 3. | City of Mount Vernon | Grant | 19.4 |
| 4. | City of Sumpter | Baker | 19.7 |
| 5. | Days Creek Census Designated Place | Douglas | 19.9 |
| 6. | Neahkahnie Census Designated Place | Tillamook | 20.5 |
| 7. | Sunriver Census Designated Place | Deschutes | 20.5 |
| 8. | Elmira Census Designated Place | Lane | 20.6 |
| 9. | Town of Dayville | Grant | 22.0 |
| 10. | Tetherow Census Designated Place | Deschutes | 22.2 |
| 11. | Crawfordsville Census Designated Place | Linn | 22.3 |
| 12. | City of Ukiah | Umatilla | 22.4 |
| 13. | City of Grass Valley | Sherman | 22.5 |
| 14. | Fair Oaks Census Designated Place | Douglas | 22.6 |
| 15. | City of Imbler | Union | 23.2 |
| 16. | Eagle Crest Census Designated Place | Deschutes | 23.8 |
| 17. | City of Seneca | Grant | 23.8 |
| 18. | City of Joseph | Wallowa | 24.0 |
| 19. | City of Richland | Baker | 24.2 |
| 20. | City of Manzanita | Tillamook | 24.3 |