28 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 17202 | Chambersburg | 32,772 |
| 17268 | Waynesboro | 29,096 |
| 17201 | Chambersburg | 27,575 |
| 17225 | Greencastle | 20,335 |
| 17222 | Fayetteville | 10,261 |
| 17236 | Mercersburg | 8,875 |
| 17252 | Saint Thomas | 4,290 |
| 17244 | Orrstown | 2,305 |
| 17224 | Fort Loudon | 1,731 |
| 17237 | Mont Alto | 1,672 |
| 17214 | Blue Ridge Summit | 1,162 |
| 17263 | State Line | 949 |
| 17262 | Spring Run | 921 |
| 17235 | Marion | 682 |
| 17246 | Pleasant Hall | 598 |
| 17254 | Scotland | 497 |
| 17221 | Fannettsburg | 496 |
| 17271 | Willow Hill | 486 |
| 17219 | Doylesburg | 444 |
| 17247 | Quincy | 419 |
| 17220 | Dry Run | 398 |
| 17265 | Upperstrasburg | 307 |
| 17210 | Amberson | 167 |
| 17217 | Concord | 141 |
| 17250 | Rouzerville | 56 |
| 17251 | Roxbury | 27 |
| 17261 | South Mountain | 26 |
| 17232 | Lurgan | 26 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 28 ZCTAs in Franklin County, Pennsylvania (US Census).