Shannon-Williamson Ranch, historic ranch in Antioch, Contra Costa County, California, United States

The Shannon-Williamson Ranch in Antioch retains about 3 acres of a former 4,000-acre ranch, including a two-story Italianate house rebuilt after the original burned in 1895, three barns, outbuildings and a small orchard. A fence surrounds the whole property, which is closed to the public.

The Williamson family settled in Antioch in 1867 and received a homestead grant in 1874 signed by President Ulysses S. Grant. The ranch operated from 1875 to 1949, raising wheat, barley, hay and livestock on land that once covered 4,000 acres. The original house burned in 1895 and was rebuilt as the present two-story Italianate building. In 1987 Donald Williamson led the effort that saved the property.

The name Shannon-Williamson Ranch reflects the two families who shaped and worked the land across generations. The buildings reveal how people lived and worked together, with simple, functional spaces that mirror the daily rhythm of farm life.

The ranch is closed to the public and there are no plans for the house and property. A fence surrounds the entire property, so the two-story Italianate house, three barns and small orchard can only be seen from outside the fence. The housing subdivision and shopping mall across the street carry the ranch name.

The ranch is the only unaltered farm from that era in this part of California and has been maintained and operated by descendants of Thomas Shannon for four generations. This continuous family stewardship has preserved the original authenticity and character of the place, making it uncommon.