California Gazetteer
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. | Plumas County | 42.9 |
| 2. | Nevada County | 43.8 |
| 3. | Sierra County | 45.4 |
| 4. | Shasta County | 51.2 |
| 5. | Calaveras County | 51.2 |
| 6. | Tuolumne County | 52.0 |
| 7. | Mariposa County | 53.1 |
| 8. | Trinity County | 53.3 |
| 9. | Siskiyou County | 55.2 |
| 10. | Modoc County | 55.5 |
| 11. | El Dorado County | 56.0 |
| 12. | Amador County | 56.8 |
| 13. | Alpine County | 57.5 |
| 14. | Humboldt County | 60.7 |
| 15. | Placer County | 62.4 |
| 16. | Butte County | 65.8 |
| 17. | Marin County | 67.7 |
| 18. | San Luis Obispo County | 68.7 |
| 19. | Lake County | 69.1 |
| 20. | Mono County | 69.4 |
