There are four third parties in California with ballot status: American Independent, Green, Libertarian, and Peace and Freedom. I analyze their registration numbers and ballot status at CAIVN.
Most interesting to me was finding that, with the exception of Peace and Freedom in L.A. County, the highest registrations for third parties in California are generally in northern, rural, agricultural counties and not in urban areas.
Lucky for us, because of Prop 14, California won’t have third parties anymore! Yay!