Iowa 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. | Buena Vista County | 78.2 |
| 2. | Crawford County | 72.7 |
| 3. | Marshall County | 66.8 |
| 4. | Woodbury County | 63.9 |
| 5. | Wright County | 56.4 |
| 6. | Muscatine County | 55.9 |
| 7. | Polk County | 53.9 |
| 8. | Wapello County | 53.5 |
| 9. | Louisa County | 52.5 |
| 10. | Franklin County | 51.0 |
| 11. | Clarke County | 50.7 |
| 12. | Tama County | 49.7 |
| 13. | Johnson County | 49.3 |
| 14. | Sioux County | 46.0 |
| 15. | Scott County | 45.7 |
| 16. | Black Hawk County | 44.8 |
| 17. | Dallas County | 40.7 |
| 18. | Hamilton County | 39.7 |
| 19. | Story County | 39.5 |
| 20. | Pottawattamie County | 38.6 |
