15 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 03743 | Claremont | 13,704 |
| 03773 | Newport | 7,681 |
| 03603 | Charlestown | 5,238 |
| 03753 | Grantham | 3,509 |
| 03782 | Sunapee | 3,122 |
| 03781 | Plainfield | 1,918 |
| 03745 | Cornish | 1,816 |
| 03280 | Washington | 1,224 |
| 03752 | Goshen | 1,042 |
| 03605 | Lempster | 907 |
| 03284 | Springfield | 890 |
| 03770 | Meriden | 604 |
| 03751 | Georges Mills | 397 |
| 03601 | Acworth | 382 |
| 03607 | South Acworth | 368 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 15 ZCTAs in Sullivan County, New Hampshire (US Census).