Irrigon is a city in Morrow County, Oregon, United States, on the Columbia River and U.S. Route 730. Take a look below for 15 fun and awesome facts about Irrigon, Oregon, United States. 1. The city is part of the Pendleton–Hermiston Micropolitan Statistical Area. 2. The population was 1,826 at the 2010 census. 3. Irrigon…