Phoenix does not have much in the way of mixed-use areas -- residences over businesses -- and is spread out.
The study authors said Phoenix is significantly changing that way it plans for growth and zoning. They expect Phoenix to move up to No. 12 on the list in the coming years, saying Americans in general are moving away from suburbia and opting for walkable urban places.
To find out the walkability of a specific neighborhood, go to WalkScore.com.