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ZIP codes in Pennington County

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

20

ZIP codes

16

cross the county line

138,280

people in these ZIPs

66

counties in SD

Most people

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Pennington County ZIP list

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Questions people actually ask

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

20 ZIP codes reach into Pennington County, including 1 PO Box or single-address ZIPs placed by the town they serve. 16 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Pennington County has the most people?

57701 (Rapid City) has about 45,795 residents, the most of any ZIP touching Pennington County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Pennington 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 Pennington 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