ZIP Code 59073

59073 is one of Montana's ZIP codes, delivering to addresses in Roundup, Musselshell County.

City: Roundup
County: Musselshell County
State: Montana
Prefix: 590xx

Where this code sits

59073 is part of the 590xx range, the group of codes handled by one mail processing centre. Roundup is served by 2 ZIP codes in total; the full list, with the county each falls in, is on the Roundup page.

Roundup Montana ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 59073 delivers to without sharing its boundary.

406 Area code 406

ZIP codes nearest 59073

The ZIP codes whose reference points sit closest to 59073.
ZIP code	Distance	Delivers to
ZIP code 59072	1.6 mi	Roundup, MT
ZIP code 59059	22 mi	Musselshell, MT
ZIP code 59046	23 mi	Lavina, MT
ZIP code 59015	28 mi	Broadview, MT
ZIP code 59105	34 mi	Billings, MT
ZIP code 59079	36 mi	Shepherd, MT
ZIP code 59087	36 mi	Winnett, MT
ZIP code 59002	36 mi	Acton, 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 59073, plotted from its record coordinates.

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

Scope ZIP code 59073. 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.