World's Happiest Countries: Gallup Survey (PHOTOS)

While the United States may still be the richest nation on Earth, it can't claim to be as happy as Denmark or Finland. In fact, according to a new analysis of data provided by the Gallup World Poll, the relationship between overall life satisfaction and wealth may not be as straightforward as previously thought.

Looking at data collected across 132 countries, the Gallup Organization based their marks -- released this month in the Journal of Personality and Social Psychology -- on representative samples of more than 136,000 people in each country. Respondents were asked how they would rate their lives on a scale from zero (worst possible) to 10 (best possible), as well as answering a series of questions on positive or negative emotions.

See Gallup's top 15 countries, each with a mean score between 7.0 and 7.7, here: