ZIP Code 03858

03858 is one of New Hampshire's ZIP codes, delivering to addresses in Newton, Rockingham County.

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

Where this code sits

03858 is part of the 038xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Newton.

Newton New Hampshire ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03858 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03858

The ZIP codes whose reference points sit closest to 03858.
ZIP code	Distance	Delivers to
ZIP code 03859	0.4 mi	Newton Junction, NH
ZIP code 01860	3.0 mi	Merrimac, MA
ZIP code 03848	3.3 mi	Kingston, NH
ZIP code 03865	3.4 mi	Plaistow, NH
ZIP code 03827	3.9 mi	East Kingston, NH
ZIP code 03826	4.6 mi	East Hampstead, NH
ZIP code 01913	5.4 mi	Amesbury, MA
ZIP code 03819	5.5 mi	Danville, NH

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 03858, plotted from its record coordinates.

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

Scope ZIP code 03858. 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.