Saint Louis County Missouri is covered by a total of 57 ZIP Codes. There are 13 ZIP Codes in Saint Louis County that extend into adjacent counties (Franklin County, Jefferson County, Monroe County, and Saint Louis City County). Of the ZIP codes within or partially within Saint Louis County there are 47 Standard ZIP Codes, 4 Unique ZIP Codes and 6 PO Box ZIP Codes.
Click on the ZIP Codes in the interactive map to view more information. The map control in the upper right corner can be used to toggle map layers on and off. The red outline is the border of Saint Louis County and can be turned on and off. Each type of postal code can also be turned on and off.