King City is a city in Washington County, Oregon, United States. Its name was picked arbitrarily by the Tualatin Development Company, Inc., which used a royalty theme in naming the city streets. The population was 3,111 at the 2010 census. Fire protection and EMS services are provided through Tualatin Valley Fire and Rescue.
The community was built by the Tualatin Development Company starting in 1964. Created as a planned community for adults, King City was incorporated in March 1966. Build-out of the original 273 acres (110 ha) finished about 1978. Originally, King City was developed as an age-restricted community governed by the rules of the King City Civic Association (KCCA) in which people under 50 could not live in the city.
The KCCA rules were later changed to conform to the 1988 amendments to the Federal Fair Housing Act, which set the age restriction to 55 or older. Later, the city, which was at first contiguous with the boundaries of KCCA, expanded to include newer, non-age restricted developments. Future expansion to the west is planned for the city, within the limits of the Portland Metropolitan Urban Growth Boundary.
According to the United States Census Bureau, the city has a total area of 0.72 square miles (1.86 km2), all of it land.
As of the census of 2010, there were 3,111 people, 1,735 households, and 729 families living in the city.