There are 6 zip codes in Marion County, Missouri. The most populated is 63401, located in Hannibal. * 2024 populations estimated based on the latest ACS 5-year data.

Zip Code
City
Population
63401Hannibal21,167
63461Palmyra5,452
63456Monroe City4,995
63454Maywood1,166
63463Philadelphia825
63471Taylor805

Marion County, Missouri Zip Codes by Population (2024)