ZIP Code 03854

03854 is one of New Hampshire's ZIP codes, delivering to addresses in New Castle, Rockingham County.

City: New Castle
County: Rockingham County
State: New Hampshire
Prefix: 038xx

Where this code sits

03854 is part of the 038xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to New Castle.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03854 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03854

The ZIP codes whose reference points sit closest to 03854.
ZIP code	Distance	Delivers to
ZIP code 03904	2.0 mi	Kittery, ME
ZIP code 03905	2.1 mi	Kittery Point, ME
ZIP code 03802	2.2 mi	Portsmouth, NH
ZIP code 03803	2.2 mi	Portsmouth, NH
ZIP code 03804	2.2 mi	Portsmouth, NH
ZIP code 03801	4.3 mi	Portsmouth, NH
ZIP code 03870	4.7 mi	Rye, NH
ZIP code 03903	5.4 mi	Eliot, ME

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 03854, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 03854. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.