Napa California is the county seat and principal city for Napa County, also referred to as Napa Valley.
Before California was granted statehood in 1849, the Napa Valley was in the Territory of California's District of Sonoma. In 1850 when counties were first organized, Napa became one of the original counties of California. At the time, its boundaries also included Lake County to the north. By this time, the indigenous people were either working as field laborers or living in small bands in the hills surrounding the valley. Tensions between the white settlers and Native Americans broke into war in 1850, with a white man's death resulting in soldiers hunting down and killing all the natives they could find, driving the remainder north toward Clear Lake. In 1851, the first courthouse was erected. By 1870, the Native American population consisted of only a few laborers and servants working for the white settlers.