What are the Sumach, Washington Zip Codes for 2020, 2019Primary Zip Codes for SumachZip CodePrimary CitySecondary City98901YakimaSumach, East Selah, Yakima Firing Center, Union Gap98903YakimaSumach, Fairview, South Broadway, Union GapCities sharing Zip Codes with SumachZip CodePrimary CitySecondary CityMore Information98901YakimaEast Selah98901YakimaSumach98901YakimaYakima Firing Center98901YakimaUnion Gap Union Gap population stats 98903YakimaFairview98903YakimaSouth Broadway98903YakimaSumach98903YakimaUnion Gap Union Gap population stats Advertisements