The happiest cities in America, according to new research

Story highlights

  • Happiness levels fluctuate wildly across the country, depending on your ZIP code
  • Boulder, Colorado, is the happiest city in America, according to new research

(CNN)I've spent my life traveling the world in the pursuit of health and happiness.

After pinpointing the places where people live the longest, healthiest lives (which I call Blue Zones regions), I turned my attention to the places where