Stanislaus California Stanislaus County is located in the fertile Central Valley of California. At its center is the city of Modesto which represents one of the mass-winemaking hubs of the central valley. Vineyards & Wineries: Apothic Barefoot Cellars Corq Dorq Falcon Ridge Montpellier Vineyards Redwood Creek Sheffield Cellars Appellations: Diablo Grande Salado Creek Tracy Hills