Johnson City is a city in Clackamas County, Oregon, United States. The population was 566 at the 2010 census. Because of its small area, it…Johnson City is a city in Clackamas County, Oregon, United States. The population was 566 at the 2010 census. Because of its small area, its population density is over 8,000 per square mile, making it the most densely populated city in Oregon.
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