Walnut Creek is a suburban community located several miles east of the city of Oakland in Contra Costa County, California, United States. It lies in the East Bay region of the San Francisco Bay Area. While not as large as neighboring Concord, Walnut Creek serves as the business and entertainment hub for the neighboring cities within central Contra Costa County, due in part to its location at the junction of the highways from Sacramento and San Jose (I-680) and San Francisco/Oakland (SR-24). As of the 2000 census, the city had a total population of 64,296.
There are three bands of Bay Miwok Indians associated with early Walnut Creek: the Saclan, whose territory extended through the hills east of present day Oakland, Rossmoor, Lafayette, Moraga, and Walnut Creek; the Volvon (also spelled Bolban,Wolwon, and Zuicun) at Mt. Diablo; and the Tactan at Danville and Walnut Creek, on San Ramon Creek.
What is now Walnut Creek was later the site of four Mexican land grants. One of those land grants – measuring 18,000 acres (73 km²) – went to Doña Juana Sanchez de Pacheco, who deeded it to her two grandsons. Ygnacio Sibrian, one of the grandsons, created the first roofed home in the valley in about 1850.