| Official Zip Code Name | New Castle |
| Zip Code State | New Hampshire |
| Primary County: | Rockingham |
| Area Code | 603 |
| Current Population: | 37081 |
| Racial Majority: | White 62.49% |
| Median Household Income | $55618 |
| Average Adjusted Gross Income | $89060 |
| Time Zone: | 5 |
| Elevation Range | 21 ft. |
| Area | 0.809 Sqm. |
| Coordinates(Y,X) | 43.064182, -70.722702 |