Study names happiest city in America: California takes the lead.

WalletHub's report ranked Fremont, a city in the San Francisco Bay Area, as the 'happiest' city in America based on 30 happiness-related data metrics. California dominated the list with San Jose, San Francisco, Irvine, Oakland, Huntington Beach, and San Diego also making the top 20. The report draws on psychological research findings that indicate a correlation between happiness and where you live. However, living in Fremont could be costly as the median home price in the area is over $1.2 million.