Camp Adair was a United States Army division training facility established north of Corvallis, Oregon, operating from 1942 to 1946. During its peak period of use, the camp was home to approximately 40,000 persons — enough to have constituted the second largest city in the state of Oregon. The camp was largely scrapped as government surplus following termination of World War II, with a portion of the site reconstituted as "Adair Air Force Station" in 1957.