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. | Schuyler County | 9.7 |
| 2. | Scotland County | 10.1 |
| 3. | Osage County | 10.7 |
| 4. | Clark County | 11.7 |
| 5. | Worth County | 12.4 |
| 6. | Gentry County | 13.0 |
| 7. | Daviess County | 14.1 |
| 8. | Ralls County | 14.2 |
| 9. | Shelby County | 14.5 |
| 10. | Knox County | 14.5 |
| 11. | Chariton County | 15.1 |
| 12. | Putnam County | 15.2 |
| 13. | Bollinger County | 15.3 |
| 14. | Holt County | 15.3 |
| 15. | Ste. Genevieve County | 16.0 |
| 16. | Atchison County | 16.1 |
| 17. | Lewis County | 16.4 |
| 18. | Reynolds County | 16.9 |
| 19. | Gasconade County | 17.1 |
| 20. | Ozark County | 17.2 |