Estimating Population Counts for Dissemination Areas and Census Tracts in Canada from 2011 to 2021

Accurate small-area population estimates are essential for health research and social policy development. While Statistics Canada provides census-year population counts for all geographic units, it does not produce intercensal estimates for Dissemination Areas (DA) and Census Tracts (CT). This study addresses this gap by estimating DA- and CT-level population counts for 2011 to 2021 using census data and interpolation techniques. Population counts were derived from Statistics Canadas Geographic Attribute Files for 2011, 2016, and 2021. We applied linear interpolation to estimate intercensal population counts (2012-2015 and 2017-2020). We used an areal-weighted interpolation technique to account for boundary shifts due to census geography changes, utilizing Statistics Canadas Correspondence Files. The final datasets provide consistent population estimates across census cycles, enabling longitudinal and neighbourhood-level analyses. The methodology and accompanying R script, available as supplementary materials, can be adapted for other intercensal periods and other demographic information, promoting transparency and reproducibility in demographic research. This study facilitates data-driven decision-making in public health and policy development by providing a reliable and scalable methodology for estimating intercensal population counts. About the Research DepartmentThe Saskatchewan Health Authority Research Department leads collaborative research to enhance Saskatchewans health and healthcare. We provide diverse research services to SHA staff, clinicians, and team members, including surveys, study design, database development, statistical analysis, and assistance with research funding. We also spearhead our own research programs to strengthen research and analytic capability and learning within Saskatchewans health system. DisclaimerThis working paper is for discussion and comment purposes. It has not been peer-reviewed nor been subject to review by Research Department staff or executives. Any opinions expressed in this paper are those of the author(s) and not those of the Saskatchewan Health Authority. Suggested CitationMarouzi Anousheh, Plante Charles. 2025. "Estimating Population Counts for Dissemination Area and Census Tracts in Canada from 2011 to 2021." MedRxiv. Author ContributionsAM conducted the data analysis and prepared the first draft of the article. AM and CP designed the study and directed its implementation, including quality assurance and control. CP supervised the data analysis. CP reviewed, edited, and finalized the text. CP provided the overall guidance and funding for the research project. All authors approved the final version of the manuscript. Funding StatementThis research was funded by the Saskatchewan Health Research Foundation (SHRF). Ethics DeclarationThis study exclusively utilizes publicly available, de-identified population data obtained from Statistics Canada. No human participants, personal identifiers, or confidential information were involved in this research, and therefore, ethical approval was not required. Conflict of InterestThe authors declare that they have no conflict of interest. Data AvailabilityAll data used in this study is for public use and can be accessed through the Statistics Canada website. Code AvailabilityCodes are available as a supplementary file to this working paper.