Madsen is an unincorporated community in Ontario, Canada.
It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Madsen had a population of 153 living in 67 of its 74 total private dwellings, a change of 4.1% from its 2016 population of 147.
With a land area of 52.74 km2 (20.36 sq mi), it had a population density of 2.9/km2 (7.5/sq mi) in 2021.
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