Vienna 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, Vienna had a population of 736 living in 235 of its 249 total private dwellings, a change of -4.8% from its 2016 population of 773.
With a land area of 2.71 km2 (1.05 sq mi), it had a population density of 271.6/km2 (703.4/sq mi) in 2021.
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