ZIP codes in Lyman County

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

ZIP codes

cross the county line

8,437

people in these ZIPs

counties in SD

Most people

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Lyman County ZIP list

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Questions people actually ask

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

9 ZIP codes reach into Lyman County. 5 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Lyman County has the most people?

57532 (Fort Pierre) has about 2,929 residents, the most of any ZIP touching Lyman County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Lyman 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 Lyman 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