Saint Charles, MO

ZIP code 63304 covers a suburban area in western St. Charles County, including parts of Weldon Spring and Cottleville. Its landscape combines residential neighborhoods, commercial corridors, and open space, with access to Missouri Route 94. Notable landmarks include the August A. Busch Memorial Conservation Area, a large outdoor recreation and wildlife area, and the Weldon Spring Site Interpretive Center, which explains the area’s nuclear-weapons-era history.