Bly is an unincorporated small town in Klamath County, Oregon, United States. By highway, it is about 50 miles east of Klamath Falls. As of 2…Bly is an unincorporated small town in Klamath County, Oregon, United States. By highway, it is about 50 miles east of Klamath Falls. As of 2020, the population was 207.