As someone originally from Oregon I've never understood why Bakersfield is Central CA, and Sacramento area is Northern CA. I don't know, when I drive back home to Oregon for a visit, there is still a whole lot of CA once I get past Sacramento LOL
It's probably not so much that there's a lot more area of CA north of Sacramento but that there's not much population so maybe that's why the Northern bar is lower in the State of CA to encompass a balance of population numbers between North and South. I still can't figure out why Central CA is lumped into Northern CA but maybe because of population again -- since Southern CA is glutted w/ people too close for comfort. You can get tired of hearing the neighbors flush their toilet or yell at their kids or have dogwalkers let their canines poop on your new cut lawn!! The joys of suburban living!