Belknap County, New Hampshire Zip Codes
| Laconia | 16,943 |
| Gilford | 7,725 |
| Belmont | 7,454 |
| Meredith | 6,701 |
| Alton | 3,617 |
| Center Barnstead | 3,406 |
| Sanbornton | 2,957 |
| New Hampton | 2,591 |
| Gilmanton | 2,338 |
| Alton Bay | 2,286 |
| Gilmanton Iron Works | 1,622 |
| Barnstead | 1,535 |
| Center Harbor | 820 |
- Population is the most recent figure from the U.S. Census Bureau's 2022 American Community Survey (ACS) 5-Year Estimates.