These Are The Most Unhappy Cities In America, Ranked According To U.S. Census Data - Page 82 of 99

18. San Diego, California

Naturally, San Diego is the biggest city in San Diego County, which has already appeared on our list a number of times. It is situated just over 100 miles south of Los Angeles and is very close to the border town of Tijuana, Mexico.

Some of the most popular areas in San Diego are the Gaslamp District, Balboa Park, and Coronado Beach. It is also home to two major commercial airports as well as the University of California San Diego.