Crystal Lake is a census-designated place (CDP) in Polk County, Florida, United States. The population was 5,341 at the 2000 census, an increase from 5,300 in 1990. The 2010 Census reported a population of 5,514. It is part of the Lakeland–Winter Haven Metropolitan Statistical Area.
The population of Crystal Lake grew by more than 200 from 2000 to 2010.
5,514 minus 5,341 is less than 200.  