So heres how it would break down. Northern California would get districts 1, 2, 3, 4, 10 and the northern bit of 5 (basically Santa Cruz county). Coastal California gets the rest of 5 plus 7. And South California gets 6, 8, 9, 11, and 12.
While its tempting to look at the number of miles of highways in each new state that the transportation agency would have to manage, thats a fools errand. Eastern California (at least down to Kings County) is home to some of the heaviest snowfall in the U.S. Currently the base at a Lake Tahoe ski area is 400 inches. The northwest part of the state is subject to heavy rain. In fact, Del Norte county gets an average of 132 inches of rain per year. Contrast that with Imperials annual average of 3 inches. Southeastern California is home to the Joshua Tree National Park, Death Valley, and a lot of desert. Add to all that the varying degrees of earthquake risk in various areas, and its easy to see that highway miles alone would not be a good predictor of likely costs.
California is home to three public college and university systems: the University of California, the California State University, and community colleges. The UC system has ten campuses: North California would get five, Coastal California two, and South California three. Would Los Angeles and Santa Barbara go along with that? In addition, the UC system has six medical centers, two national laboratories, and a host of other activities. What a mess.