Union Gap Real Estate View 57 listings HomeGuidesUnion Gap Nestled in the “gap” of two mountains, Union Gap is a blend of the old and the new. A small town with stately old homes, historical events, and farmers markets all within a few blocks from progressive shopping, theaters, restaurants and industry. Guides YakimaSelahGleedNachesEast ValleyHistoric DistrictTerrace HeightsMoxeeWest ValleyUnion Gap