ZIP Code 03031

03031 is one of New Hampshire's ZIP codes, delivering to addresses in Amherst, Hillsborough County.

City: Amherst
County: Hillsborough County
State: New Hampshire
Prefix: 030xx

Where this code sits

03031 is part of the 030xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Amherst.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03031 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03031

The ZIP codes whose reference points sit closest to 03031.
ZIP code	Distance	Delivers to
ZIP code 03055	3.3 mi	Milford, NH
ZIP code 03057	4.5 mi	Mont Vernon, NH
ZIP code 03054	4.8 mi	Merrimack, NH
ZIP code 03110	7.2 mi	Bedford, NH
ZIP code 03086	7.6 mi	Wilton, NH
ZIP code 03063	7.6 mi	Nashua, NH
ZIP code 03049	7.6 mi	Hollis, NH
ZIP code 03052	7.8 mi	Litchfield, 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 03031, plotted from its record coordinates.

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

Scope ZIP code 03031. 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.