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ZIP codes in Big Horn County

15 ZIPs touch Big Horn County, Wyoming. The blue dashed line is the county border; orange ZIPs reach into it.

15

ZIP codes

4

cross the county line

31,055

people in these ZIPs

23

counties in WY

Most people

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Big Horn County ZIP list

More counties in Wyoming

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Questions people actually ask

How many ZIP codes are in Big Horn County, Wyoming?

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

Which ZIP code in Big Horn County has the most people?

82435 (Powell) has about 12,337 residents, the most of any ZIP touching Big Horn County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Big Horn 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 Big Horn 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