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9. Copenhagen, Denmark

Copenhagen, the capital of Denmark, has held on to the ninth spot from last year and marks its sixth consecutive appearance on Mercer's list of the top 15 cities to live in.

Health and well-being is a big priority for the Danish people with nearly a quarter of them aged 60 and older, according to government data. Increased health awareness has translated into Denmark becoming one of the leading consumers and producers of organic food in Europe. Almost 75 percent of food served by city-run businesses like daycares in Copenhagen is organic. Copenhagen is also known as the city of cyclists with a total 218 miles of cycle tracks, resulting in about 35 percent of its population commuting by bicycle every day.

Despite being lauded for its high quality of life, Denmark's economy has struggled, impacted by the euro zone debt crisis. The Danish economy shrank 0.4 percent in the second quarter of the year. Consumption, one of the country's main growth drivers, has remained weak even with record-low interest rates, due in part to a property bubble bust in 2007 that has left many households in debt and cautious over spending.

Merten Snijders | Getty Images