ZIP codes in McCook County

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

ZIP codes

cross the county line

20,318

people in these ZIPs

counties in SD

Most people

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McCook County ZIP list

More counties in South Dakota

All 66 counties in South Dakota

Questions people actually ask

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

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

Which ZIP code in McCook County has the most people?

57042 (Madison) has about 7,756 residents, the most of any ZIP touching McCook County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in McCook 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 McCook 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