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ZIP codes in Yellowstone County

26 ZIPs touch Yellowstone County, Montana. The blue dashed line is the county border; orange ZIPs reach into it.

26

ZIP codes

9

cross the county line

173,824

people in these ZIPs

56

counties in MT

Most people

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Yellowstone County ZIP list

More counties in Montana

All 56 counties in Montana

Questions people actually ask

How many ZIP codes are in Yellowstone County, Montana?

26 ZIP codes reach into Yellowstone County, including 10 PO Box or single-address ZIPs placed by the town they serve. 9 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Yellowstone County has the most people?

59102 (Billings) has about 47,977 residents, the most of any ZIP touching Yellowstone County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Yellowstone 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 Yellowstone 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