StatCan uses a number of different criteria to measure cities. The number most often quoted is the Census Metropolitan Area, but for the sake of density comparisons it isn't very good.
The better alternative is the Population Centre which StatCan defines as:
Quote:
A population centre (POPCTR) has a population of at least 1,000 and a population density of 400 persons or more per square kilometre, based on the current census population count. All areas outside population centres are classified as rural areas.
Taken together, population centres and rural areas cover all of Canada.
Population centres are classified into three groups, depending on the size of their population:
small population centres, with a population between 1,000 and 29,999
medium population centres, with a population between 30,000 and 99,999
large urban population centres, with a population of 100,000 or more.
Population centre population includes all population living in the cores, secondary cores and fringes of census metropolitan areas (CMAs) and census agglomerations (CAs), as well as the population living in population centres outside CMAs and CAs.
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Moncton's Population Centre:
Saint John's Population Centre:
Moncton's Population Centre density: 819 per km2.
Saint John's Population Centre density: 457 per km2.
Halifax's: 1100.
Toronto: 2931.