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10. Portland, OR

Population: 2.14 million
% commute by walking: 2.8%
% commute by mass transit: 5.9%
Average commute: 25.3 minutes
Number of parks: 39.5

The Portland metro area has density, where things are close together, and the current development is aimed at maintain that density. “It’s a very walkable city,” said Sperling, who lives in Portland. Plus, there’s ongoing expansion of bike paths, light rail and a trolley system. And, it has one of the highest number of dog parks on the top 10 list, with 25.

It is estimated that Portland residents travel 20 percent fewer miles for their commute each day than the national average, for a total savings per year of more than $2 billion.

Rich Iwasaki | Getty Images