Imnaha is an unincorporated community at the confluence of Little Sheep Creek and the Imnaha River in Wallowa County, Oregon, United States. Its elevation is 1,965 feet (599 m). In 2003 its population was estimated to be 12 (180 if including nearby ranches). Oregon Route 350 connects Imnaha to the nearest incorporated city, Joseph, Oregon, 30 miles (48 km) to the west. The name Imnaha means "land ruled over by Imna"; Imna was a local Native American subchief. The post office in Imnaha opened January 4, 1885, but the townsite wasn't established until 1901; it was platted in 1902.