Districts in California geographically divide the U.S. state into overlapping regions for political and administrative purposes.
From the founding of the state until 2008, the responsibility of redrawing the state's Congressional, Assembly, Senate, and Board of Equalization districts had been exercised by the California state legislature.
In November 2008, California voters passed Proposition 11, the Voters FIRST Act, which took political redistricting responsibility away from the state legislature and instead established a 14-member statewide redistricting commission composed of five Republicans, five Democrats, and four not affiliated with either of those two parties but registered with another party or as decline-to-state. The California Citizens Redistricting Commission was initially charged with updating the state assembly, senate, and Board of Equalization district boundaries starting with the 2010 census. Another initiative, Proposition 20, passed in 2010, expanded the Commission responsibilities to also include the state Congressional districts.
California is divided into 53 Congressional districts.
Each district elects a representative to serve in the United States House of Representatives as part of the California's congressional delegation.
California's current districts were drawn in 2011 by a California Citizens Redistricting Commission. The new boundaries took effect for the June 12, 2012 primary.
California is divided into 40 State Senate districts, each of which elects a senator to the State Senate. Twice the size of an Assembly district, each senate district contains about 931,000 people. The combined Senate roster is available from senate