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ZIP codes in Woodbury County

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

27

ZIP codes

12

cross the county line

112,699

people in these ZIPs

99

counties in IA

Most people

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Woodbury County ZIP list

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Questions people actually ask

How many ZIP codes are in Woodbury County, Iowa?

27 ZIP codes reach into Woodbury County, including 1 PO Box or single-address ZIPs placed by the town they serve. 12 of them are only partly in the county and also cover a neighboring county.

Which ZIP code in Woodbury County has the most people?

51106 (Sioux City) has about 28,592 residents, the most of any ZIP touching Woodbury County, in the Census Bureau’s ACS 2020–2024 estimates.

Can a ZIP code be in Woodbury 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 Woodbury 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