Clackamas County /ˈklækəməs/ is a county in the U.S. state of Oregon. As of the 2010 United States Census, the population was 375,992. It is Oregon's third-most populous county. Its county seat is Oregon City.
Clackamas County /ˈklækəməs/ is a county in the U.S. state of Oregon. As of the 2010 United States Census, the population was 375,992. It is Oregon's third-most populous county. Its county seat is Oregon City.