Walla Walla is the largest city in and the county seat of Walla Walla County, Washington, United States.The population of the city itself was 31,731 at the 2010 census. The population of Walla Walla and its two suburbs, the town of College Place and unincorporated "East Walla Walla," is about 45,000. Walla Walla is in the southeastern region of Washington, approximately four-and-a-half hours away by car from Portland, Oregon, and Seattle, Washington, and only thirteen miles north of the Oregon border.