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. | Catron County | 46.0 |
| 2. | Los Alamos County | 49.5 |
| 3. | McKinley County | 54.6 |
| 4. | Sierra County | 61.8 |
| 5. | Harding County | 63.3 |
| 6. | Hidalgo County | 63.9 |
| 7. | Lincoln County | 64.5 |
| 8. | De Baca County | 64.5 |
| 9. | Mora County | 65.6 |
| 10. | Quay County | 66.1 |
| 11. | Grant County | 66.3 |
| 12. | Colfax County | 67.3 |
| 13. | Guadalupe County | 68.6 |
| 14. | Union County | 68.8 |
| 15. | Luna County | 68.9 |
| 16. | Doña Ana County | 70.1 |
| 17. | Santa Fe County | 72.0 |
| 18. | Roosevelt County | 72.9 |
| 19. | Eddy County | 72.9 |
| 20. | San Miguel County | 73.1 |
