ZIP codes in Gallatin County
14 ZIPs touch Gallatin County, Montana. The blue dashed line is the county border; orange ZIPs reach into it.
14
ZIP codes
5
cross the county line
127,049
people in these ZIPs
56
counties in MT
Most people
Gallatin County ZIP list
More counties in Montana
- Daniels County5
- Dawson County8
- Deer Lodge County5
- Fallon County5
- Fergus County12
- Flathead County19
- Garfield County9
- Glacier County5
- Golden Valley County3
- Granite County5
- Hill County10
- Jefferson County9
Questions people actually ask
How many ZIP codes are in Gallatin County, Montana?
14 ZIP codes reach into Gallatin County, including 4 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Gallatin County has the most people?
59718 (Bozeman) has about 44,585 residents, the most of any ZIP touching Gallatin County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Gallatin 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 Gallatin 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