What are the Union Gap, Washington Zip Codes for 2020, 2019Primary Zip Codes for Union GapZip CodePrimary CitySecondary City98901YakimaUnion Gap, East Selah, Sumach, Yakima Firing Center,98903YakimaUnion Gap, Fairview, South Broadway, Sumach,Cities sharing Zip Codes with Union GapZip CodePrimary CitySecondary CityMore Information98901YakimaEast Selah98901YakimaSumach98901YakimaYakima Firing Center98901YakimaUnion Gap Union Gap population stats 98903YakimaFairview98903YakimaSouth Broadway98903YakimaSumach98903YakimaUnion Gap Union Gap population stats Advertisements