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. | Pickens County | 28.5 |
| 2. | Oconee County | 32.6 |
| 3. | Anderson County | 39.3 |
| 4. | Abbeville County | 44.5 |
| 5. | Lexington County | 44.8 |
| 6. | Cherokee County | 45.2 |
| 7. | Allendale County | 47.4 |
| 8. | Horry County | 47.9 |
| 9. | Kershaw County | 48.1 |
| 10. | Union County | 48.8 |
| 11. | York County | 49.0 |
| 12. | Georgetown County | 49.5 |
| 13. | Laurens County | 49.9 |
| 14. | Williamsburg County | 51.4 |
| 15. | Lee County | 52.1 |
| 16. | Spartanburg County | 52.3 |
| 17. | Beaufort County | 52.5 |
| 18. | Aiken County | 52.7 |
| 19. | Chester County | 52.7 |
| 20. | McCormick County | 52.9 |
