Santa Barbara County, officially the County of Santa Barbara, is a county located in the southern portion of the U.S. state of California, on the Pacific coast. As of 2010 the county had a population of 423,895. The county seat is Santa Barbara and the largest city is Santa Maria. The county is part of the Tech Coast.
The Santa Barbara County area, including the Northern Channel Islands, was first settled by Native Americans at least 13,000 years ago. Evidence for a Paleoindian presence has been found in the form of a fluted Clovis-like point found in the 1980s along the western Santa Barbara Coast, as well as the remains of Arlington Springs Man found on Santa Rosa Island in the 1960s. For thousands of years, the area was home to the Chumash tribe of Native Americans, complex hunter-gatherers who lived along the coast and in interior valleys leaving rock art in many locations including Painted Cave.
Europeans first contacted the Chumash in AD 1542, when three Spanish ships under the command of Juan Rodríguez Cabrillo explored the area. The Santa Barbara Channel received its name from Spanish explorer Sebastián Vizcaíno when he sailed over the channel waters in 1602; he entered the channel on December 4, the day of the feast of Santa Barbara. Although Spanish ships associated with the Manila Galleon trade probably contacted the Chumash intermittently during this "protohistoric" period, the Spanish first colonized Santa Barbara County in AD 1769, when the DeAnza expedition explored the area and laid plans to establish a series of missions and presidios (forts).
European contacts had devastating effects on the Chumash Indians, including a series of disease epidemics that drastically reduced Chumash population. The Chumash survived, however, and thousands of Chumash descendants still live in the Santa Barbara area or surrounding counties.
The Presidio of Santa Barbara was established in 1782 (one of 5 in California), followed by Mission Santa Barbara in 1786 – both in what is now the city of Santa Barbara. The presidio and mission kept Vizcaino's denomination, as did the later city and county – a common practice which has preserved the names of many of the 21 California Missions.
Following the Mexican secularization of the missions in the 1830s, the mission pasture lands were mostly broken up into large ranchos and granted mainly to prominent local citizens who already lived in the area. 604 of these land grants were later confirmed by the state of California – 36 in Santa Barbara County.
Santa Barbara County was one of the 26 original counties of California, formed in 1850 at the time of statehood. The county's territory was later divided to create Ventura County in 1872.