Founded in 1840, Belknap County is one of 10 counties in the state of New Hampshire. Historically, Belknap County was formed from parts of Merrimack County and Strafford County. The city of Laconia is the county seat. With FIPS code of 1, Belknap County has a population of 63,705 and area of 401 square miles (1,039 km2).
List of all cities in Belknap County, NH alphabetically
| City/Town | Postal Code | Area Code |
| Alton, NH | 03809 | 603 |
| 03810 | 603 | |
| Alton Bay, NH | 03810 | 603 |
| Barnstead, NH | 03218 | 603 |
| Belmont, NH | 03220 | 603 |
| BRM J Jill, NH | 03298 | 603 |
| Center Barnstead, NH | 03225 | 603 |
| Center Harbor, NH | 03226 | 603 |
| 03226 | 603 | |
| CTR Barnstead, NH | 03225 | 603 |
| CTR Harbor, NH | 03226 | 603 |
| Gilford, NH | 03247 | 603 |
| 03249 | 603 | |
| Gilmanton, NH | 03237 | 603 |
| Gilmanton Iron Works, NH | 03837 | 603 |
| Guilford, NH | 03249 | 603 |
| J Jill, NH | 03298 | 603 |
| 03299 | 603 | |
| Laconia, NH | 03246 | 603 |
| 03247 | 603 | |
| Lakeport, NH | 03246 | 603 |
| 03247 | 603 | |
| Lochmere, NH | 03252 | 603 |
| Meredith, NH | 03253 | 603 |
| New Hampton, NH | 03256 | 603 |
| Northfield, NH | 03276 | 603 |
| Sanbornton, NH | 03269 | 603 |
| Tilton, NH | 03276 | 603 |
| 03298 | 603 | |
| 03299 | 603 | |
| Weirs Beach, NH | 03246 | 603 |
| 03247 | 603 | |
| West Alton, NH | 03810 | 603 |
| Winnisquam, NH | 03289 | 603 |