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Aggregate dissemination areas 2021 Digital boundary files (DBF). Aggregate dissemination areas (ADAs) are created by grouping existing dissemination geographic areas, including census tracts (CTs), census subdivisions (CSDs) or dissemination areas (DAs). ADAs cover the entire country and, where possible, have a population between 5,000 and 15,000 based on the previous census population counts. ADA boundaries respect provincial, territorial, census division (CD), census metropolitan area (CMA) and census agglomeration (CA) boundaries. The intent of the ADA geography is to ensure the availability of census data, where possible, across all regions of Canada. |