Yakima County is a county in the U.S. state of Washington. As of the 2020 census, its population was 256,728. The county seat and most populous city is Yakima. Yakima County encompasses most of the Yakama Indian Reservation, and federal, state, or tribal governments own nearly 200 million acres of land in 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.