Roundup Montana ZIP Codes
Roundup holds 2 ZIP codes, all inside one county and one postal prefix.
Every ZIP code in Roundup
| ZIP code | County |
|---|---|
| 59072 | Musselshell County |
| 59073 | Musselshell County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Roundup codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Roundup. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Roundup ZIP code begins 590. Those first three digits identify the sectional center facility that processes mail for this part of Montana. Statewide that range covers 75 ZIP codes, so Roundup accounts for 3% of it.
Every Montana ZIP prefix and the region it covers →
Area codes covering Roundup
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Roundup occupies.
Roundup Montana area codes in full →
Where Roundup's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Roundup
| City | Distance | ZIP codes |
|---|---|---|
| Lavina Montana ZIP codes | 22 mi | 1 ZIP code |
| Broadview Montana ZIP codes | 29 mi | 1 ZIP code |
| Melstone Montana ZIP codes | 34 mi | 1 ZIP code |
| Ryegate Montana ZIP codes | 36 mi | 1 ZIP code |
| Winnett Montana ZIP codes | 40 mi | 1 ZIP code |
| Grass Range Montana ZIP codes | 42 mi | 1 ZIP code |
| Billings Montana ZIP codes | 46 mi | 14 ZIP codes |
| Laurel Montana ZIP codes | 55 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.