ZIP codes in Stillwater County
10 ZIPs touch Stillwater County, Montana. The blue dashed line is the county border; orange ZIPs reach into it.
10
ZIP codes
7
cross the county line
10,862
people in these ZIPs
56
counties in MT
Most people
Stillwater County ZIP list
More counties in Montana
- Richland County9
- Roosevelt County10
- Rosebud County12
- Sanders County11
- Sheridan County11
- Silver Bow County10
- Sweet Grass County7
- Teton County12
- Toole County10
- Treasure County3
- Valley County14
- Wheatland County6
Questions people actually ask
How many ZIP codes are in Stillwater County, Montana?
10 ZIP codes reach into Stillwater County. 7 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Stillwater County has the most people?
59019 (Columbus) has about 4,438 residents, the most of any ZIP touching Stillwater County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Stillwater 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 Stillwater 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