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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.
On June 16, 1970, the residents of a trailer court owned by Delbert Johnson voted 49-to-10 to incorporate. Johnson had started the development in 1959, and in 1968 was unsuccessful in having the area annexed to Gladstone. The 55th Oregon Legislative Assembly in 1969 established a boundary review board to prevent an increase in small incorporated cities, but proponents of Johnson City's incorporation had filed for an election before the law took effect.
According to the United States Census Bureau, the city has a total area of 0.07 square miles (0.18 km2), all of it land.
As of the census of 2010, there were 566 people, 268 households, and 141 families living in the city. The population density was 8,085.7 inhabitants per square mile (3,121.9/km2). There were 278 housing units at an average density of 3,971.4 per square mile (1,533.4/km2). The racial makeup of the city was 84.3% White, 0.4% African American, 1.4% Native American, 1.9% Asian, 7.4% from other races, and 4.6% from two or more races. Hispanic or Latino of any race were 15.4% of the population.
There were 268 households, of which 19.8% had children under the age of 18 living with them, 36.9% were married couples living together, 13.1% had a female householder with no husband present, 2.6% had a male householder with no wife present, and 47.4% were non-families. 40.3% of all households were made up of individuals, and 14.9% had someone living alone who was 65 years of age or older.