Klamath Falls is a city in and the county seat of Klamath County, Oregon, United States. The city was originally called Linkville when George Nurse founded the town in 1867. It was named after the Link River, on whose falls the city was sited. The name was changed to Klamath Falls in 1893. The population was 21,813 at the 2020 census. With its suburb Altamont, a census-designated place, the combined population of the towns is 42,046 residents. The city is on the southeastern shore of the Upper Klamath Lake, at the foothills of the Cascade Range, and is home to the Oregon Institute of Technology.