There are 10 zip codes in Buchanan County, Missouri. The most populated is 64506, located in Saint Joseph. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6450622,241Saint Joseph
6450714,316Saint Joseph
6450312,033Saint Joseph
6450110,567Saint Joseph
6450410,348Saint Joseph
644431,734Easton
644011,299Agency
64448935Faucett
64440904De Kalb
64484819Rushville

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