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. | Elk County | 6.6 |
| 2. | Jefferson County | 6.7 |
| 3. | Cameron County | 6.9 |
| 4. | Armstrong County | 7.0 |
| 5. | Warren County | 7.8 |
| 6. | Bedford County | 8.1 |
| 7. | Potter County | 8.2 |
| 8. | Susquehanna County | 8.7 |
| 9. | Tioga County | 8.9 |
| 10. | Venango County | 8.9 |
| 11. | Clarion County | 9.6 |
| 12. | Fulton County | 9.7 |
| 13. | Bradford County | 9.8 |
| 14. | Mifflin County | 10.3 |
| 15. | Wyoming County | 10.5 |
| 16. | Clinton County | 11.3 |
| 17. | Crawford County | 12.0 |
| 18. | Perry County | 12.1 |
| 19. | Blair County | 12.3 |
| 20. | Butler County | 12.4 |
