Ione is a city in Morrow County, Oregon, United States. The population was 329 at the 2010 census. It is part of the Pendleton–Hermiston Mi…Ione is a city in Morrow County, Oregon, United States. The population was 329 at the 2010 census. It is part of the Pendleton–Hermiston Micropolitan Statistical Area. Ione is at an elevation of 1,089 feet between the Columbia River to the north and the Blue Mountains to the southeast. It is along Oregon Route 74, 18 miles northwest of Heppner, 27 miles south of Interstate 84, and 173 miles east of Portland.
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