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About the data

Historical comparison of census subdivisions (municipalities), 2001 and 2006

The boundaries and names of census subdivisions (municipalities) can change from one census to the next. In order to facilitate data comparisons between censuses, the data for the 2001 census subdivisions (municipalities) have been adjusted to reflect as closely as possible the 2006 boundaries of these areas.

For some census subdivisions (municipalities), it was not possible to reflect the 2006 boundaries. Therefore, it was not possible to calculate the 2001 to 2006 percentage change or data pertaining to 2001. In addition, some census subdivisions (municipalities) were incompletely enumerated in 2001 or were suppressed. Therefore, it was not possible to calculate the 2001 to 2006 percentage change or data pertaining to 2001.

Historical comparison of census metropolitan areas and census agglomerations, 2001 and 2006

A few census metropolitan areas (CMAs) and census agglomerations (CAs) have different geographical boundaries in 2006 as compared to 2001. In order to facilitate data comparisons, the 2001 CMA and CA data have been adjusted to reflect as closely as possible the 2006 CMA and CA boundaries; therefore, care should be taken when looking at the 2001 Census data.

Random rounding and percentage distributions

To ensure the confidentiality of responses collected for the 2006 Census, a random rounding process is used to alter the values reported in individual cells. As a result, when these data are summed or grouped, the total value may not match the sum of the individual values, since the total and subtotals are independently rounded. Similarly, percentage distributions, which are calculated on rounded data, may not necessarily add up to 100%.

Non-permanent residents and the census universe

In the 2006 Census, non-permanent residents are defined as people from another country who, at the time of the census, held a Work or Study Permit, or who were refugee claimants, as well as family members living in Canada with them. In the 1991, 1996 and 2001 censuses, non-permanent residents also included persons who held a Minister's permit; this was discontinued by Citizenship and Immigration Canada prior to the 2006 Census.

From 1991 on, the Census of Population has enumerated both permanent and non-permanent residents of Canada. Prior to 1991, only permanent residents of Canada were included in the census. (The only exception to this occurred in 1941.) Non-permanent residents were considered foreign residents and were not enumerated.

Total population counts, as well as counts for all variables, are affected by this change in the census universe. Users should be especially careful when comparing data from 1991, 1996, 2001 or 2006 with data from previous censuses in geographic areas where there is a concentration of non-permanent residents.

Today in Canada, non-permanent residents make up a significant segment of the population, especially in several census metropolitan areas. Their presence can affect the demand for such government services as health care, schooling, employment programs and language training. The inclusion of non-permanent residents in the census facilitates comparisons with provincial and territorial statistics (marriages, divorces, births and deaths) which include this population. In addition, this inclusion of non-permanent residents brings Canadian practice closer to the United Nations (UN) recommendation that long-term residents (persons living in a country for one year or longer) be enumerated in the census.

Although every attempt has been made to enumerate non-permanent residents, factors such as language difficulties, the reluctance to complete a government form or to understand the need to participate may have affected the enumeration of this population.

For additional information, please refer to the
2006 Census Dictionary, catalogue number 92-566-XWE.