In the first half of the 19th century, a series of census were done in order to determine the distribution of parliamentary representation. The Census for Lower Canada, 1825 marked the first collection of statistics. It took place between June 20 and September 20, 1825.

Enumerators visited 20 census districts, divided into 246 multiple enumeration units known as sub-districts. These units were made up of cities, towns, parishes, villages and townships. The total count of the population of Lower Canada in 1825 was 479,288 individuals.

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