Union Gap is a city in Yakima County, Washington, United States. As of the 2020 census, the city population was 6,568. Union Gap has beco…Union Gap is a city in Yakima County, Washington, United States. As of the 2020 census, the city population was 6,568. Union Gap has become the retail hub for the entire Yakima Valley as a result of Valley Mall and other thriving businesses being located here. Part of the city is part of the Yakama Nation.
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