Newcastle zip code
Zip code in Newcastle, NH
The location Newcastle belongs to Rockingham County, state of New Hampshire. Newcastle has been assigned with the zip code 03854.
The location name Newcastle is listed as unacceptable by the US Postal Service so any mailing should avoid it. Instead you can use New Castle, the official name of the location.
| Zip code | Type | Population |
|---|---|---|
| 03854 | PO BOX | 1,012 |
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