| Zip Code | City | Population ↓ |
|---|---|---|
| 3743 | Claremont | 13,647 |
| 3773 | Newport | 7,758 |
| 3603 | Charlestown | 5,218 |
| 3753 | Grantham | 3,407 |
| 3782 | Sunapee | 3,074 |
| 3745 | Cornish | 1,914 |
| 3781 | Plainfield | 1,840 |
| 3280 | Washington | 1,097 |
| 3752 | Goshen | 1,077 |
| 3605 | Lempster | 934 |
| 3284 | Springfield | 798 |
| 3770 | Meriden | 638 |
| 3601 | Acworth | 478 |
| 3751 | Georges Mills | 374 |
| 3607 | South Acworth | 320 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 15 ZCTAs in Sullivan County, New Hampshire (US Census).