Trosa is a municipality in central Sweden, in the county of Södermanland. The municipality covers an area of 207.9 km². Of the total population of 10197, 5105 are male, and 5092 are female. The population density of the community is 49 inhabitants per km².
... 4,454 families residing in the town. The population density is 943.4/km² (2,444.3/mi²). There are 5,418 housing units at an average density of 300.6/km² ...