Yakima County, Washington

Yakima County is a county in the U.S. state of Washington. As of the 2010 census, its population was 243,231. The county seat and largest city is Yakima. The county was formed out of Ferguson County on January 21, 1865 and is named for Yakama tribe of Native Americans. Ferguson County, no longer in existence, had been created from Walla Walla County on January 23, 1863.