[6] Created as a planned community for adults, King City was incorporated in March 1966.

[7] 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.

54.1% of all households were made up of individuals, and 43.7% had someone living alone who was 65 years of age or older.

63.4% of all households were made up of individuals, and 55.2% had someone living alone who was 65 years of age or older.

None of the families and 2.4% of the population were living below the poverty line, including no persons under the age of 18 and 2.1% of those over 64.