Address: 1355 W Poplar St, Walla Walla, WA, 99362 From modest beginnings in 1953, Gesa Credit Union has grown from a part-time office operating out of a shoebox to the second largest credit union in Washington state, serving over 250,000 members around the world. Gesa has a rich history of providing financial services to Washington state and our spirit still reflects the early-day Credit Union motto, “people helping people.”