Retirees are swelling some communities quickly, such as The Villages, a planned retirement haven in central Florida. The population of The Villages and its surrounding suburbs ballooned 29%, to 93,420, between 2007 and 2010, according to the U.S. census, putting it at the top of our list. Around 87,000 of those residents live in the retirement community at the area’s core, a spread of tidy, single-story homes clustered around two “town squares” with shops and restaurants. The retirement community’s population is up from 68,000 in 2007, said Villages spokesman Gary Lester, and it’s aiming to reach 110,000 residents by 2016. With the baby boom generation reaching retirement age, that looks like an attainable goal.