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Knoxville is an 
unincorporated community
An unincorporated area is a parcel of land that is not governed by a local general-purpose municipal corporation. (At p. 178.) They may be governed or serviced by an encompassing unit (such as a county) or another branch of the state (such as th ...
in Napa County
Napa County () is a County (United States), county north of San Pablo Bay located in the Northern California, northern portion of the U.S. state of California. As of the 2020 United States census, the population was 138,019. The county seat i ...
, California
California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...
. It lies at an elevation of 1322 feet (403 m). Knoxville is located north-northeast of Saint Helena
Saint Helena (, ) is one of the three constituent parts of Saint Helena, Ascension and Tristan da Cunha, a remote British overseas territory.
Saint Helena is a volcanic and tropical island, located in the South Atlantic Ocean, some 1,874 km ...
.
The Knoxville post office opened in 1863, moved in 1904 and 1907, and closed permanently in 1912. The name commemorates Ranar B. Knox, owner of a local mine and first post master.
Knoxville was a mercury mining district in the 1860s and 1870s. It declined in the late nineteenth century, only to temporarily bounce back during the World Wars as the need for mercury in detonating devices increased. While a school, post office, and mill once stood at the site, by 1979 only the derelict store remained.
The Knoxville area is now a popular site for off-highway vehicle
An off-road vehicle (ORV), also known as an off-highway vehicle (OHV), overland vehicle or adventure vehicle, is a type of transportation specifically engineered to navigate unpaved roads and surfaces. These include trails, forest roads, and o ...
recreation, with dozens of miles of former mining trails.
References
Unincorporated communities in Napa County, California Vaca Mountains Unincorporated communities in California {{NapaCountyCA-geo-stub