Gregory L Miller (Postmaster)
gregory.l.miller@usps.gov
2959 S Highway 94
Defiance, MO 63341
Defiance, MO 63341
The Defiance Post Office is located in the state of Missouri within St Charles County. This location serves 3,530 Defiance residents with a median income of $89,648. It's estimated that approximately 5,634 packages pass through this post office each year.