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In page Trosa Municipality:

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During the summer, the municipality sees its population of 14´000 (2021) increase fourfold[citation needed]. This is mostly due to people living in the Stockholm area that, during the summer, move to their holiday cottages in the municipality. Being close to Stockholm, the municipality is a favourite amongst tourists from abroad. The well-equipped harbour and Trosa's archipelago also attract many pleasure boats from both Sweden and the other countries bordering the Baltic Sea.