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ZIP codes in Dewey County

10 ZIPs touch Dewey County, South Dakota. The blue dashed line is the county border; orange ZIPs reach into it.

10

ZIP codes

6

cross the county line

11,218

people in these ZIPs

66

counties in SD

Most people

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Dewey County ZIP list

More counties in South Dakota

All 66 counties in South Dakota

Questions people actually ask

How many ZIP codes are in Dewey County, South Dakota?

10 ZIP codes reach into Dewey County. 6 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Dewey County has the most people?

57625 (Eagle Butte) has about 3,775 residents, the most of any ZIP touching Dewey County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Dewey 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 Dewey 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