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ZIP codes in Osceola County

8 ZIPs touch Osceola County, Iowa. The blue dashed line is the county border; orange ZIPs reach into it.

8

ZIP codes

6

cross the county line

10,433

people in these ZIPs

99

counties in IA

Most people

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Osceola County ZIP list

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Questions people actually ask

How many ZIP codes are in Osceola County, Iowa?

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

Which ZIP code in Osceola County has the most people?

51249 (Sibley) has about 3,564 residents, the most of any ZIP touching Osceola County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Osceola 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 Osceola 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