According to the website Pothole.info here are the Top 10 Worst Cities for Potholes:

1. San Jose, CA
2. Los Angeles, CA
3. The Bay Area of CA
4. Kansas City, MO
5. New Orleans, LA
6. San Diego, CA
7. Sacramento, CA
8. St. Louis, MO
9. Omaha, NE
10 New York, NY