Union Gap is a city in Yakima County, Washington, United States. The population was 6,568 at the 2020 census. Union Gap has become th…Union Gap is a city in Yakima County, Washington, United States. The population was 6,568 at the 2020 census. 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.