ZIP codes in Cerro Gordo County
18 ZIPs touch Cerro Gordo County, Iowa. The blue dashed line is the county border; orange ZIPs reach into it.
18
ZIP codes
12
cross the county line
50,762
people in these ZIPs
99
counties in IA
Most people
Cerro Gordo County ZIP list
More counties in Iowa
- Buena Vista County14
- Butler County18
- Calhoun County15
- Carroll County17
- Cass County13
- Cedar County18
- Cherokee County15
- Chickasaw County10
- Clarke County9
- Clay County17
- Clayton County24
- Clinton County24
Questions people actually ask
How many ZIP codes are in Cerro Gordo County, Iowa?
18 ZIP codes reach into Cerro Gordo 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 Cerro Gordo County has the most people?
50401 (Mason City) has about 28,703 residents, the most of any ZIP touching Cerro Gordo County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Cerro Gordo 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 Cerro Gordo 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