There are 10 zip codes in Buchanan County, Iowa. The most populated is 50644, located in Independence. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
50644Independence8,705
50629Fairbank2,374
50682Winthrop1,649
50641Hazleton1,446
52210Brandon946
52329Rowley757
52326Quasqueton727
50650Lamont693
50607Aurora417
50654Masonville328

Buchanan County, Iowa Zip Codes by Population (2024)