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. | Moscow Census Designated Place | Allegany | 1.0 |
| 2. | Town of Barton | Allegany | 5.3 |
| 3. | Town of Grantsville | Garrett | 6.9 |
| 4. | Crellin Census Designated Place | Garrett | 7.6 |
| 5. | Carlos Census Designated Place | Allegany | 8.2 |
| 6. | Town of Lonaconing | Allegany | 8.5 |
| 7. | Town of Deer Park | Garrett | 8.7 |
| 8. | Town of Kitzmiller | Garrett | 9.2 |
| 9. | Mount Savage Census Designated Place | Allegany | 9.4 |
| 10. | Finzel Census Designated Place | Garrett | 9.5 |
| 11. | Flintstone Census Designated Place | Allegany | 9.6 |
| 12. | Town of Loch Lynn Heights | Garrett | 10.3 |
| 13. | Vale Summit Census Designated Place | Allegany | 10.4 |
| 14. | Bloomington Census Designated Place | Garrett | 10.4 |
| 15. | Gilmore Census Designated Place | Allegany | 10.5 |
| 16. | Town of Midland | Allegany | 10.9 |
| 17. | Town of Clear Spring | Washington | 11.4 |
| 18. | Shaft Census Designated Place | Allegany | 11.5 |
| 19. | Town of Mountain Lake Park | Garrett | 12.0 |
| 20. | Bier Census Designated Place | Allegany | 12.5 |