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. | Christian County | 56.7 |
| 2. | Jefferson County | 54.0 |
| 3. | Fayette County | 52.6 |
| 4. | Hardin County | 45.3 |
| 5. | Fulton County | 45.0 |
| 6. | Warren County | 43.4 |
| 7. | Shelby County | 42.4 |
| 8. | Franklin County | 36.7 |
| 9. | Bourbon County | 34.4 |
| 10. | Graves County | 32.2 |
| 11. | McCracken County | 32.1 |
| 12. | Woodford County | 31.9 |
| 13. | Union County | 31.4 |
| 14. | Boyle County | 30.3 |
| 15. | Simpson County | 29.3 |
| 16. | Scott County | 28.5 |
| 17. | Webster County | 28.4 |
| 18. | Marion County | 28.3 |
| 19. | Boone County | 28.3 |
| 20. | Henderson County | 28.1 |
