The population estimates are produced by the Demography Division, Statistics Canada, and are based on the 1996 and 2001 Census counts. The data used are population estimates by single year of age (up to 90+) and sex for Ontario’s Census Subdivisions (CSD), as of July 1, 1996 – 2006.

The latest update to the population estimates includes revisions to postcensal estimates for 2003–2005 and new estimates for 2006, released by Statistics Canada in June 2007.