The Shannon-Williamson Ranch, is located in Antioch, California. The Williamson family settled in Antioch in 1867. They were granted a homestead in 1874 signed by then U.S. President Ulysses S. Grant. The original house burned down in 1895. The current house that stands is the one that was rebuilt after the fire. The ranch operated from 1875 to 1949. The ranch was saved in 1987 by the efforts of one of the inhabitants of the house Donald Williamson. The once 4,000-acre (1,600 ha) ranch raised crops such as wheat, barley, hay, and livestock. The ranch currently retains approximately 3 acres (1.2 ha) of the former ranch including a two-story Italianate house, 3 barns and several other buildings including outbuildings and a small orchard. The ranch is currently closed to the public and there are currently no plans for the future of the house and property. The surrounding area has been named after the ranch such as the housing subdivision and the shopping mall directly across the street from it. The ranch property has a fence that surrounds the entire property.

Shannon Williamson Ranch
U.S. National Register of Historic Places
U.S. Historic district
Show map of California Show map of the United States
Location	RR 1/Lone Tree Way, Antioch, California
Coordinates	37°57′40.73″N 121°45′45.33″W / 37.9613139°N 121.7625917°W / 37.9613139; -121.7625917
Area	398 acres (161 ha)
Architect	Williamson Family
Architectural style	Italianate
NRHP reference No.	87000003[1]
Added to NRHP	January 29, 1987