28 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 03301 | Concord | 33,995 |
| 03303 | Concord | 16,571 |
| 03106 | Hooksett | 15,032 |
| 03275 | Suncook | 12,205 |
| 03276 | Tilton | 9,015 |
| 03235 | Franklin | 8,903 |
| 03304 | Bow | 8,335 |
| 03242 | Henniker | 6,197 |
| 03229 | Contoocook | 6,046 |
| 03307 | Loudon | 5,724 |
| 03234 | Epsom | 4,939 |
| 03257 | New London | 4,484 |
| 03263 | Pittsfield | 4,105 |
| 03046 | Dunbarton | 3,097 |
| 03278 | Warner | 3,079 |
| 03258 | Chichester | 2,721 |
| 03224 | Canterbury | 2,392 |
| 03221 | Bradford | 2,200 |
| 03216 | Andover | 2,046 |
| 03255 | Newbury | 2,015 |
| 03287 | Wilmot | 1,487 |
| 03268 | Salisbury | 1,468 |
| 03230 | Danbury | 1,451 |
| 03260 | North Sutton | 976 |
| 03243 | Hill | 952 |
| 03273 | South Sutton | 361 |
| 03233 | Elkins | 156 |
| 03231 | East Andover | 89 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 28 ZCTAs in Merrimack County, New Hampshire (US Census).