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ZIP codes in Sheridan County

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

11

ZIP codes

4

cross the county line

4,353

people in these ZIPs

56

counties in MT

Most people

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Sheridan County ZIP list

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All 56 counties in Montana

Questions people actually ask

How many ZIP codes are in Sheridan County, Montana?

11 ZIP codes reach into Sheridan County. 4 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Sheridan County has the most people?

59254 (Plentywood) has about 1,822 residents, the most of any ZIP touching Sheridan County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Sheridan 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 Sheridan 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