ZIP codes in Black Hawk County
20 ZIPs touch Black Hawk County, Iowa. The blue dashed line is the county border; orange ZIPs reach into it.
20
ZIP codes
11
cross the county line
145,777
people in these ZIPs
99
counties in IA
Most people
Black Hawk County ZIP list
More counties in Iowa
- Adair County14
- Adams County10
- Allamakee County11
- Appanoose County11
- Audubon County12
- Benton County24
- Boone County23
- Bremer County13
- Buchanan County16
- Buena Vista County14
- Butler County18
- Calhoun County15
Questions people actually ask
How many ZIP codes are in Black Hawk County, Iowa?
20 ZIP codes reach into Black Hawk County, including 2 PO Box or single-address ZIPs placed by the town they serve. 11 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Black Hawk County has the most people?
50613 (Cedar Falls) has about 43,867 residents, the most of any ZIP touching Black Hawk County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Black Hawk 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 Black Hawk 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