Mannheim 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, Mannheim had a population of 1,002 living in 330 of its 332 total private dwellings, a change of 2% from its 2016 population of 982.
With a land area of 0.99 km2 (0.38 sq mi), it had a population density of 1,012.1/km2 (2,621.4/sq mi) in 2021.
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