ZIP Code 59403

59403 is one of Montana's ZIP codes, delivering to addresses in Great Falls, Cascade County.

City: Great Falls
County: Cascade County
State: Montana
Prefix: 594xx

Where this code sits

59403 is part of the 594xx range, the group of codes handled by one mail processing centre. Great Falls is served by 5 ZIP codes in total; the full list, with the county each falls in, is on the Great Falls page.

Great Falls Montana ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 59403 delivers to without sharing its boundary.

406 Area code 406

ZIP codes nearest 59403

The ZIP codes whose reference points sit closest to 59403.
ZIP code	Distance	Delivers to
ZIP code 59402	0.0 mi	Malmstrom Afb, MT
ZIP code 59401	1.4 mi	Great Falls, MT
ZIP code 59404	2.0 mi	Great Falls, MT
ZIP code 59414	2.1 mi	Black Eagle, MT
ZIP code 59405	2.4 mi	Great Falls, MT
ZIP code 59406	8.8 mi	Great Falls, MT
ZIP code 59472	9.2 mi	Sand Coulee, MT
ZIP code 59487	14 mi	Vaughn, MT

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 59403, plotted from its record coordinates.

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

Scope ZIP code 59403. 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.