What are the Cascade, Maryland Zip Codes for 2020, 2019Primary Zip Codes for CascadeZip CodePrimary CitySecondary City21719CascadeCascade, Highfield, Fort RitchieCities sharing Zip Codes with CascadeZip CodePrimary CitySecondary CityMore Information21719CascadeHighfield21719CascadeFort Ritchie Fort Ritchie population stats Advertisements