Buchanan County, Iowa ZIP Codes

10 ZIP Codes

Zip Code
City
Population ↓
50644Independence8,419
50629Fairbank2,082
50641Hazleton1,950
50682Winthrop1,692
52210Brandon958
52326Quasqueton694
52329Rowley671
50650Lamont648
50607Aurora403
50654Masonville275

Overview of ZIP Codes in Buchanan County

ZCTAs are geographic areas created by the US Census Bureau to approximate the delivery areas of ZIP Codes for statistical analysis. While ZCTAs use the same five-digit codes as ZIP Codes, they represent defined geographic areas that may not exactly match the mail delivery routes of ZIP Codes.
10
ZIP Codes

The data shown reflect ZCTAs from the US Census. As of 2025, there are 10 ZCTAs in Buchanan County, Iowa (US Census).

Sources

  1. US Census: 2025 Gazetteer Files
  2. US Census: ZIP Code Tabulation Areas (ZCTAs)

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