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U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

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Buchanan County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Buchanan County.

County State ZIP Code City Area Codes
Buchanan County IA 50607 Aurora 319, 563
Buchanan County IA 50629 Fairbank 319
Buchanan County IA 50641 Hazleton 319, 563
Buchanan County IA 50644 Independence 319
Buchanan County IA 50648 Jesup 319
Buchanan County IA 50650 Lamont 319, 563
Buchanan County IA 50671 Stanley 319, 563
Buchanan County IA 50682 Winthrop 319, 563
Buchanan County IA 52210 Brandon 319
Buchanan County IA 52326 Quasqueton 319
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.