Flen is a municipality in central Sweden, in the county of Södermanland. The municipality covers an area of 718.1 km². Of the total population of 16565, 8303 are male, and 8262 are female. The population density of the community is 23 inhabitants per km².
... size is 2.86 and the average family size is 3.32.
In the town the population is spread out with 24.7% under the age of 18, 7.4% from 18 to 24, 32.6% from 25 to 44, ...