ZIP Code 59866

59866 is one of Montana's ZIP codes, delivering to addresses in Saint Regis, Mineral County.

City: Saint Regis
County: Mineral County
State: Montana
Prefix: 598xx

Where this code sits

59866 is part of the 598xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Saint Regis.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 59866 delivers to without sharing its boundary.

406 Area code 406

ZIP codes nearest 59866

The ZIP codes whose reference points sit closest to 59866.
ZIP code	Distance	Delivers to
ZIP code 59830	9.1 mi	De Borgia, MT
ZIP code 59842	11 mi	Haugan, MT
ZIP code 59859	16 mi	Plains, MT
ZIP code 59867	17 mi	Saltese, MT
ZIP code 59872	17 mi	Superior, MT
ZIP code 59856	18 mi	Paradise, MT
ZIP code 59873	20 mi	Thompson Falls, MT
ZIP code 59845	30 mi	Hot Springs, 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 59866, plotted from its record coordinates.

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

Scope ZIP code 59866. 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.