Klamath County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 69,413. The county seat is Klamath Falls. The county was named for the Klamath, the tribe of Native Americans living in the area at the time the first European explorers entered the region. Klamath County comprises the Klamath Falls, OR Micropolitan Statistical Area.