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Eskilstuna Municipality is a municipality in Södermanland County in southeast Sweden, between Lake Mälaren and Lake Hjälmaren. The seat of the municipality is in the city of Eskilstuna.

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Flen Municipality is a municipality in central Södermanland County in southeast Sweden. Its seat is located in the city of Flen.

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Gnesta Municipality is a municipality in Södermanland County in southeast Sweden. Its seat is located in the town of Gnesta, with some 5,000 inhabitants.

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Katrineholm Municipality is a municipality in Södermanland County in southeast Sweden. Its seat is located in the city of Katrineholm.

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Nyköping Municipality is a municipality in Södermanland County in southeast Sweden. Its seat is located in the city of Nyköping. Its southern tip in the district of Tunaberg is the southernmost point of mainland Svealand, one of the three original crowns forming Sweden.

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Oxelösund Municipality is a municipality in Södermanland County in southeast Sweden. Its seat is located in the city of Oxelösund.

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Strängnäs Municipality is a municipality in Södermanland County in eastern Sweden, located by Lake Mälaren. Its seat is located in the city of Strängnäs.

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Trosa Municipality is a municipality in Södermanland County in southeast Sweden. The municipality is built up by the localities of Vagnhärad, Västerljung, Stensund, Sund and the town of Trosa. The seat of the municipality is located in the town of Trosa.

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Vingåker Municipality is a municipality in Södermanland County in central Sweden. Its seat is located in the town of Vingåker.