There are a lot of different approaches to measure happiness levels in a given country and, of course, they are all imperfect. These two recent studies seem interesting though: According to the latest Gallup, these are the happiest countries:

% Thriving in 3+ Elements of Well-being

1. Panama 61
2. Costa Rica 44
3. Denmark 40
4. Austria 39
5. Brazil 39
6. Uruguay 37
7. El Salvador 37
8. Sweden 36
9. Guatemala 34
10. Canada 34

And these lists are by the UC Berkeley professors, teaching “Science of Happiness” EdX MOOC:

Subjective Happiness

1. Costa Rica
2. Croatia
3. Chile
4. Malaysia
5. Colombia

Life Satisfaction

1. Costa Rica
2. Chile
3. Thailand
4. Colombia
5. Switzerland

Flourishing

1. Costa Rica
2. Chile
3. Thailand
4. Colombia
5. Switzerland

If you want, you can also view complete lists.