What are the Lake St Louis, Missouri Zip Codes for 2020, 2019Primary Zip Codes for Lake St LouisZip CodePrimary CitySecondary City63367Lake Saint LouisLake St Louis, Lsl, Ofallon, O FallonCities sharing Zip Codes with Lake St LouisZip CodePrimary CitySecondary CityMore Information63367Lake Saint LouisLake St Louis63367Lake Saint LouisO Fallon63367Lake Saint LouisLsl63367Lake Saint LouisOfallonAdvertisements