There are 20 zip codes in Franklin County, Missouri. The most populated is 63090, located in Washington. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
6309022,105Washington
6308420,071Union
6306914,961Pacific
6308013,530Sullivan
6307711,437Saint Clair
630686,376New Haven
630895,855Villa Ridge
630723,936Robertsville
630372,782Gerald
630602,240Lonedell
630152,029Catawissa
630551,674Labadie
630561,615Leslie
630731,511Saint Albans
630131,191Beaufort
63039644Gray Summit
63014502Berger
63041251Grubville
63079209Stanton
6306164Luebbering

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