Lancaster 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, Lancaster had a population of 729 living in 320 of its 342 total private dwellings, a change of -2.8% from its 2016 population of 750.
With a land area of 0.72 km2 (0.28 sq mi), it had a population density of 1,012.5/km2 (2,622.4/sq mi) in 2021.
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