Tustin Ranch is a community located in the city of Tustin, California in Orange County, California. The property is historically part of the Irvine Ranch, and was a land preserve up until the creation of the community. The Irvine Company decided to build the planned community in 1982; it was approved for construction in 1986 by the County of Orange. It was annexed to the city of Tustin in 1986, and formed the 92782 ZIP Code. The Tustin Ranch was formerly a citrus ranch prior to the 1980s before its development. Today, no citrus ranches can be found on the Tustin Ranch plan, but almost all of the community streets are named after components of the former ranch.