ZIP Code 03237

03237 is one of New Hampshire's ZIP codes, delivering to addresses in Gilmanton, Belknap County.

City: Gilmanton
County: Belknap County
State: New Hampshire
Prefix: 032xx

Where this code sits

03237 is part of the 032xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Gilmanton.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03237 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03237

The ZIP codes whose reference points sit closest to 03237.
ZIP code	Distance	Delivers to
ZIP code 03220	4.5 mi	Belmont, NH
ZIP code 03837	6.0 mi	Gilmanton Iron Works, NH
ZIP code 03252	7.2 mi	Lochmere, NH
ZIP code 03307	7.3 mi	Loudon, NH
ZIP code 03298	7.6 mi	Tilton, NH
ZIP code 03299	7.6 mi	Tilton, NH
ZIP code 03289	7.7 mi	Winnisquam, NH
ZIP code 03224	8.4 mi	Canterbury, 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 03237, plotted from its record coordinates.

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

Scope ZIP code 03237. 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.