Eureka is an unincorporated community in Walla Walla County, in the U.S. state of Washington.[1]
Eureka was laid out in 1904, and named after nearby Eureka Flat.[2] A post office called Eureka was established in 1889, and remained in operation until 1964.[3]
46°18′11″N 118°37′00″W / 46.30306°N 118.61667°W