Yakima County is a county in the state of Washington, United States. According to the 2020 census, the county had a population of 256,728. The city of Yakima is the administrative center and also the most populous city in the county. Yakima County encompasses much of the Yakama Indian Reservation, and the federal, state, or tribal governments own nearly 200 million acres of land within the county.

The McAllister Museum of Aviation is the leading preservationist and educator of aviation history in Central Washington. The museum is housed in the original hangar of the McAllister Flying Service which provided all aviation services to aviators until the building of the Yakima airport. The museum includes 30+ displays featuring Yakima Aviation history, Yakima Aviators and their military service.