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Jackson grew first as a watering hole for cattle, then as one of the earliest and most durable of the Mother Lode's hard rock mining areas. In 1853, Jackson became the county seat of newly formed Amador County, California. Previously, from 1851â1852, it had been the county seat of Calaveras County.
For the wine region, see Napa Valley AVA. Napa County is a county located north of San Pablo Bay in the northern portion of the U.S. state of California. As of the 2010 census, the population was 136,484. The county seat is the City of Napa. Napa County was one of the original counties of California, created in 1850 at the time of statehood.