ZIP codes in Powder River County
10 ZIPs touch Powder River County, Montana. The blue dashed line is the county border; orange ZIPs reach into it.
10
ZIP codes
6
cross the county line
14,564
people in these ZIPs
56
counties in MT
Most people
Powder River County ZIP list
More counties in Montana
- Missoula County19
- Musselshell County6
- Park County11
- Petroleum County4
- Phillips County8
- Pondera County6
- Powell County8
- Prairie County8
- Ravalli County10
- Richland County9
- Roosevelt County10
- Rosebud County12
Questions people actually ask
How many ZIP codes are in Powder River County, Montana?
10 ZIP codes reach into Powder River County, including 1 PO Box or single-address ZIPs placed by the town they serve. 6 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Powder River County has the most people?
59301 (Miles City) has about 11,643 residents, the most of any ZIP touching Powder River County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Powder River County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Powder River County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from