New Castle zip code
Zip code in New Castle, NH
The location New Castle belongs to Rockingham County, state of New Hampshire. New Castle has been assigned with the zip code 03854.
New Castle is the official name of the location so if you want to use the US Postal Service you must use that name.
| Zip code | Type | Population |
|---|---|---|
| 03854 | PO BOX | 1,012 |
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