Source:California, United States. Pioneer and Immigrant Files, 1790-1950

From Ancestry's description:

Some 10,000 records are contained in this database with biographical information about pioneers who arrived in California prior to 1860. The information is recorded on a series of index cards which were collected into the California Information File beginning in the early 1900s. Many of the facts were contributed by the pioneers themselves, their descendents, or other resources some of which are noted in the records. Available facts about individuals includes name, birth date and location, parents’ names, spouse’s name, marriage date and location, death date and location, and can include extensive personal details like profession or occupation, residence before California, residence in California, political offices held, education, politics, participation in principle events of California history, and lists of descendants.

Original data: California State Library - Sacramento Co, Sacramento, California, Pioneer Index File (1906–1934); A–Z. Sacramento, California: California State Library.