Eskilstuna is a city and the seat of Eskilstuna Municipality, Sodermanland County, Sweden. The city of Eskilstuna had 67 359 inhabitants in 2015, with a total municipal population of 100,092 inhabitants in Eskilstuna municipality. Eskilstuna has a large Sweden Finn population. The town is located on the River Eskilstunaån, which connects Lake Hjalmaren and Lake Malaren.