It may not come as too much of a surprise that California has a strong presence in the top 10 most expensive cities, including San Jose grabbing the top spot with the average household paying $3,151 per month on bills (66.8 percent above the national average). (How is that possible!?) San Francisco was the second most expensive, while Los Angeles landed the no. 4 spot. San Diego and Riverside also made it into the top 10, giving the Golden State half the spots.