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
Population
City
506448,705Independence
506292,374Fairbank
506821,649Winthrop
506411,446Hazleton
52210946Brandon
52329757Rowley
52326727Quasqueton
50650693Lamont
50607417Aurora
50654328Masonville

Zip Codes in Buchanan County, Iowa by Population (2024)