Jackson (formerly, Botilleas, Botilleas Spring, Bottileas, Bottle Spring, and Botellas) is the county seat of Amador County, California. The population was 4,651 at the 2010 census, up from 3,989 at the 2000 census. The city is accessible by both State Route 49 and State Route 88.
According to the United States Census Bureau, the city has a total area of 3.7 square miles (9.7 km²), all of it land. Jackson Creek traverses the city. Alluvial soils such as Pardee Cobbly Loam is found throughout the Jackson area.
The area was inhabited by the Northern Sierra Indians, who occupied areas along creeks, spring and seep areas, including permanent and seasonal drainages, flat ridges and terraces. Therefore, areas along watercourses are considered likely locations for prehistoric cultural resources. Permanent villages were usually placed on elevations above seasonal flood levels. Surrounding areas were used for hunting and seed, acorn, and grass gathering.