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. | Jasper County | 71.1 |
| 2. | Saluda County | 67.3 |
| 3. | Richland County | 61.9 |
| 4. | Berkeley County | 61.4 |
| 5. | Marlboro County | 60.7 |
| 6. | Sumter County | 59.6 |
| 7. | Dillon County | 59.2 |
| 8. | Newberry County | 58.5 |
| 9. | Greenwood County | 57.8 |
| 10. | Hampton County | 57.7 |
| 11. | Edgefield County | 57.2 |
| 12. | Clarendon County | 57.1 |
| 13. | Florence County | 56.5 |
| 14. | Charleston County | 56.3 |
| 15. | Calhoun County | 56.2 |
| 16. | Barnwell County | 55.9 |
| 17. | Marion County | 55.9 |
| 18. | Colleton County | 54.7 |
| 19. | Chesterfield County | 54.6 |
| 20. | Fairfield County | 54.6 |
