Napa Valley Napa County, California The Napa Valley AVA encompasses the valley of the Napa River in Napa County - basically the whole county southwest of Lake Berryessa. It was the second appellation declared by the US government on January 28th, 1981. As one of the most famous and prolific viticultural regions in the world, the Napa Valley is subdivided into a number of AVAs. Wineries: Ballentine Vineyards Beaulieu Vineyard Chateau Montelena Clos Pegase Cosentino Darioush Edgewood Estate Franciscan Oakville Estate Francis Coppola Frank Family Vineyards Grgich Hills Cellar Havens Wine Cellars Hayman & Hill Heitz Wine Cellars Hendry Hess Collection Kenefick Ranch Laird Family Estate Markham Vineyards Martin Ray Mason Mumm Napa Newlan Vineyards & Winery Newton Vineyard Mountain Winery Peju Picchetti Winery Prager Winery & Port Works Q Vineyards Robert Mondavi Winery Robert Pepi S. Anderson Silver Oak St. Supéry Vineyards & Winery Stags' Leap Winery Terra Valentine Thomas Fogarty Truchard Turnbull Unity V. Sattui Winery Warnke Cellars White Oak Vineyards & Winery AVAs within the Napa Valley: Howell Mountain Oak Knoll District Mt. Veeder Rutherford Atlas Peak Chiles Valley Diamond Mountain District Oak Knoll District Oakville St. Helena Spring Mountain District Stag's Leap District Yountville