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.
| Name | County | Diversity Index | |
|---|---|---|---|
| 1. | City of Treynor | Pottawattamie | 1.1 |
| 2. | City of Wall Lake | Sac | 1.2 |
| 3. | Douds Census Designated Place | Van Buren | 1.2 |
| 4. | City of Chester | Howard | 1.5 |
| 5. | City of Houghton | Lee | 1.5 |
| 6. | City of Auburn | Sac | 1.7 |
| 7. | City of Lake View | Sac | 2.0 |
| 8. | City of Sully | Jasper | 2.0 |
| 9. | City of Stanton | Montgomery | 2.1 |
| 10. | City of Deep River | Poweshiek | 2.1 |
| 11. | City of Dedham | Carroll | 2.2 |
| 12. | City of Templeton | Carroll | 2.3 |
| 13. | City of Protivin | Howard | 2.5 |
| 14. | City of Greeley | Delaware | 2.5 |
| 15. | City of Stout | Grundy | 2.6 |
| 16. | City of Ridgeway | Winneshiek | 2.7 |
| 17. | City of Allison | Butler | 2.8 |
| 18. | City of Coggon | Linn | 2.8 |
| 19. | City of Superior | Dickinson | 2.9 |
| 20. | City of Webb | Clay | 2.9 |
