California is the runaway leader in a competition it's not particularly proud to win.  According to the National Insurance Crime Bureau here are the Top 10 Worst Cities for Car Theft:

 

1. Bakersfield, CA

2. Fresno, CA

3. Modesto, CA

4. San Francisco-Oakland, CA

5. Stockton, CA

6. Redding, CA

7. Spokane-Spokane Valley, WA

8. Vallejo-Fairfield, CA

9. San Jose, CA

10. Yuba City, CA