Identifiers: borough · CDP
| Rank | Community | Population |
|---|---|---|
| 1 | Lewistown (borough), PA | 8,579 |
| 2 | Boalsburg (CDP), PA | 4,577 |
| 3 | Burnham (borough), PA | 1,991 |
| 4 | Belleville (CDP), PA | 1,947 |
| 5 | Church Hill (CDP), PA | 1,711 |
| 6 | Milroy (CDP), PA | 1,550 |
| 7 | Highland Park (CDP), PA | 1,317 |
| 8 | Centre Hall (borough), PA | 1,268 |
| 9 | Yeagertown (CDP), PA | 1,002 |
| 10 | McClure (borough), PA | 889 |
| 11 | Mifflintown (borough), PA | 840 |
| 12 | Port Royal (borough), PA | 807 |
| 13 | Strodes Mills (CDP), PA | 698 |
| 14 | Reedsville (CDP), PA | 579 |
| 15 | Juniata Terrace (borough), PA | 564 |
| 16 | Mifflin (borough), PA | 530 |
| 17 | Allensville (CDP), PA | 479 |
| 18 | Granville (CDP), PA | 424 |
| 19 | Mexico (CDP), PA | 398 |
| 20 | Spring Mills (CDP), PA | 365 |