The data crunchers at FindTheHome have an interesting approach . If you count robbery as a “violent” crime as opposed to a mere property” crime, the “high crime” areas shift and San Francisco becomes the highest crime area in the State! Take a look at this great interactive graphic that shows, among other things, that Del Norte’s crime rate is twice ours. I always knew Crescent City was a pit. I just didn’t have proof.
I think this statistic- how likely are you to be a victim of crime in general- is a lot more useful than splitting it up. YMMV. It’s a great map. Have fun with it.