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.
In 1986, the Tustin Ranch became part of the city of Tustin and was assigned the 92782 ZIP Code. The area had previously been a citrus farm before being developed in the 1980s. Today, none of the original citrus farms remain on the Tustin Ranch development, but many of the community streets are named after elements from the former ranch.