Denmark overtook Switzerland as the world's happiest place, according to a report released on Wednesday, with Australia also finishing in the top 10.
The report, prepared by the Sustainable Development Solutions Network (SDSN) and the Earth Institute at Columbia University, showed Syria, Afghanistan and eight sub-Saharan countries as the 10 least happy places on earth to live.
The top 10 this year were Denmark, Switzerland, Iceland, Norway, Finland, Canada, Netherlands, New Zealand, Australia, and Sweden.
The bottom 10 were Madagascar, Tanzania, Liberia, Guinea, Rwanda, Benin, Afghanistan, Togo, Syria and Burundi.
The United States came in at 13, the United Kingdom at 23, France at 32, and Italy at 50.
"There is a very strong message for my country, the United States, which is very rich, has gotten a lot richer over the last 50 years, but has gotten no happier," said Professor Jeffrey Sachs, head of the SDSN.
"The message for the United States is clear. For a society that just chases money, we are chasing the wrong things. Our social fabric is deteriorating, social trust is deteriorating, faith in government is deteriorating," he said.
The report, now in its fourth edition, ranks 157 countries by happiness levels using factors such as per capita gross domestic product (GDP) and healthy years of life expectancy.
It also rates "having someone to count on in times of trouble" and freedom from corruption in government and business.
The survey showed that three countries in particular, Ireland, Iceland and Japan, were able to maintain their happiness levels despite external shocks such as the post-2007 economic crisis and the 2011 earthquake because of social support and solidarity.
Sachs pointed to Costa Rica, which came in 14th and ahead of many wealthier countries, as an example of a healthy, happy society although it is not an economic powerhouse.