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 Reading | Berks | 90.2 |
| 2. | City of Hazleton | Luzerne | 87.4 |
| 3. | City of Allentown | Lehigh | 87.2 |
| 4. | City of Lancaster | Lancaster | 86.8 |
| 5. | Borough of West Hazleton | Luzerne | 86.7 |
| 6. | City of York | York | 85.4 |
| 7. | Borough of Norristown | Montgomery | 85.3 |
| 8. | Warminster Heights Census Designated Place | Bucks | 84.8 |
| 9. | Borough of Avondale | Chester | 83.6 |
| 10. | Toughkenamon Census Designated Place | Chester | 81.1 |
| 11. | Borough of Kennett Square | Chester | 80.5 |
| 12. | Penn Estates Census Designated Place | Monroe | 80.4 |
| 13. | City of Coatesville | Chester | 80.3 |
| 14. | City of Lebanon | Lebanon | 79.8 |
| 15. | City of Harrisburg | Dauphin | 79.2 |
| 16. | Borough of Steelton | Dauphin | 78.2 |
| 17. | Borough of Freemansburg | Northampton | 77.8 |
| 18. | City of Easton | Northampton | 77.2 |
| 19. | Pine Ridge Census Designated Place | Pike | 76.9 |
| 20. | Hyde Park Census Designated Place | Berks | 76.8 |
