There are 58 counties in California. The city and county of San Francisco have consolidated functions and is classified as a municipal government that operates primarily as a city. All other counties are each governed by a board of supervisors.
There are 397 county subdivisions in California. They are all census county divisions (CCDs), which are delineated for statistical purposes, have no legal function, and are not governmental units. CCDs were first established in California for the 1960 census. Prior to 1960, the minor civil divisions used in the census included election precincts, judicial townships, supervisor’s districts, and one American Indian reservation (in 1870).