ZIP Code 03603

03603 is one of New Hampshire's ZIP codes, delivering to addresses in Charlestown, Sullivan County.

City: Charlestown
County: Sullivan County
State: New Hampshire
Prefix: 036xx

Where this code sits

03603 is part of the 036xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Charlestown.

Charlestown New Hampshire ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 03603 delivers to without sharing its boundary.

603 Area code 603

ZIP codes nearest 03603

The ZIP codes whose reference points sit closest to 03603.
ZIP code	Distance	Delivers to
ZIP code 05156	4.8 mi	Springfield, VT
ZIP code 03601	6.8 mi	Acworth, NH
ZIP code 05101	8.1 mi	Bellows Falls, VT
ZIP code 03607	8.1 mi	South Acworth, NH
ZIP code 03609	8.2 mi	North Walpole, NH
ZIP code 05150	8.3 mi	North Springfield, VT
ZIP code 03743	8.3 mi	Claremont, NH
ZIP code 03604	9.0 mi	Drewsville, 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 03603, plotted from its record coordinates.

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

Scope ZIP code 03603. 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.