Lake Mary is a city in Seminole County, Florida, United States. The population was 11,456 at the 2000 census. As of 2009, the population recorded by the U.S. Census Bureau is 15,230. Lake Mary is part of the Orlando–Kissimmee–Sanford Metropolitan Statistical Area. Rated by Money magazine as the #4 best place to live in America in the August 2007 issue.