Department of the Pacific had six subordinate military districts during the Civil War: On July 27, 1865 the Military Division of the Pacific was created under Major General Henry W. Halleck, replacing the Department of the Pacific, consisting of the Department of the Columbia that now consisted of the state of Oregon and the territories of Washington and Idaho and the expanded Department of California that now consisted of the states of California and Nevada and the Territory of New Mexico and Territory of Arizona. On 30 May 1898, Gen. Wesley Merritt established in San Francisco the Headquarters, US Expeditionary Forces and Department of
Pacific, Washington from the Mud Mountain Dam caused even greater flooding, inundating more than a hundred homes. Pacific is located at (47.263272, -122.247831). According to the United States Census Bureau, the city has a total area of , of which, is land and is water. The lower White River, also known as the Stuck River, runs through the east side of Pacific, between Auburn, Washington and Sumner, Washington. As of the census of 2010, there were 6,606 people, 2,269 households, and 1,605 families residing in the city. The population density was . There were 2,422 housing units at an average density of