ZIP Code 03307

03307 is one of New Hampshire's ZIP codes, delivering to addresses in Loudon, Merrimack County.

City: Loudon
County: Merrimack County
State: New Hampshire
Prefix: 033xx

Where this code sits

03307 is part of the 033xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Loudon.

Loudon New Hampshire ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03307 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03307

The ZIP codes whose reference points sit closest to 03307.
ZIP code	Distance	Delivers to
ZIP code 03224	5.2 mi	Canterbury, NH
ZIP code 03258	5.9 mi	Chichester, NH
ZIP code 03263	7.1 mi	Pittsfield, NH
ZIP code 03237	7.3 mi	Gilmanton, NH
ZIP code 03301	7.6 mi	Concord, NH
ZIP code 03305	7.7 mi	Concord, NH
ZIP code 03218	9.0 mi	Barnstead, NH
ZIP code 03234	9.0 mi	Epsom, 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 03307, plotted from its record coordinates.

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

Scope ZIP code 03307. 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.