ZIP Code 59231

59231 is one of Montana's ZIP codes, delivering to addresses in Saint Marie, Valley County.

City: Saint Marie
County: Valley County
State: Montana
Prefix: 592xx

Where this code sits

59231 is part of the 592xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Saint Marie.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 59231 delivers to without sharing its boundary.

406 Area code 406

ZIP codes nearest 59231

The ZIP codes whose reference points sit closest to 59231.
ZIP code	Distance	Delivers to
ZIP code 59230	14 mi	Glasgow, MT
ZIP code 59244	17 mi	Larslan, MT
ZIP code 59273	17 mi	Vandalia, MT
ZIP code 59248	21 mi	Nashua, MT
ZIP code 59241	21 mi	Hinsdale, MT
ZIP code 59225	25 mi	Frazer, MT
ZIP code 59260	26 mi	Richland, MT
ZIP code 59223	28 mi	Fort Peck, 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 59231, plotted from its record coordinates.

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

Scope ZIP code 59231. 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.