Oroville is the county seat of Butte County, California, United States. The population of the city was 15,506 at the 2010 census, up from 13,004 in the 2000 census. Following the 2018 Camp Fire that destroyed much of the town of Paradise, the population of Oroville increased as many people who lost their homes relocated to nearby Oroville. In 2020, the 2020 census recorded the population of Oroville at 20,042.

Ishi was the last known member of the Native American Yahi people from the present-day state of California in the United States. The rest of the Yahi were killed in the California genocide in the 19th century. Ishi, who was widely described as the "last wild Indian" in the United States, lived most of his life isolated from modern North American culture, and was the last-known Native manufacturer of stone arrowheads. In 1911, aged 50, he emerged at a barn and corral, 2 mi (3.2 km) from downtown Oroville, California.