What are the Weldon Spring Heights, Missouri Zip Codes for 2020, 2019Primary Zip Codes for Weldon Spring HeightsZip CodePrimary CitySecondary City63304Saint CharlesWeldon Spring Heights, Cottleville, Weldon Spring, Saint Peters, St PetersCities sharing Zip Codes with Weldon Spring HeightsZip CodePrimary CitySecondary CityMore Information63304Saint CharlesSaint Peters63304Saint CharlesSt Peters63304Saint CharlesWeldon Spring Heights63304Saint CharlesCottleville Cottleville population stats 63304Saint CharlesWeldon Spring Weldon Spring population stats Advertisements