Municipal boundaries are ignored in determining population centres and they are focused entirely on their geographic and built-up nature.
A population centre does not necessarily correspond to the boundaries of a municipality or of a census division.
Despite this, numerous other communities which are considered part of the Greater Toronto Area for political purposes are not part of the population centre of Toronto; because more rural areas separate them geographically from the primary zone of urban settlement, communities such as Milton, Georgetown, Caledon East, Bolton, Nobleton, and Stouffville instead form their own separate small or medium population centres,[2] and even a portion of the city of Toronto itself, to the north and east of the Toronto Zoo in Scarborough, is excluded from the population centre as it is much less densely populated than the rest of the city.
However, the Statistics Canada definition of a population centre is that it does not cross the boundaries of a Census Metropolitan Area (CMA); even though the band of continuous urban development emanating outward from downtown Toronto along the shore of Lake Ontario extends even further into Hamilton and Oshawa, these two cities are both considered separate CMAs by Statistics Canada rather than being part of Toronto's, and accordingly each is also considered a distinct population centre.
For example, Ottawa has seven distinct population centres (Ottawa-Gatineau, Constance Bay, Kanata, Richmond, Osgoode, Manotick and Metcalfe),[3] the neighbouring city of Gatineau has a secondary population centre at Buckingham in addition to its primary urban core forming part of Ottawa-Gatineau, and Greater Sudbury has eight distinct population centres (Sudbury, Azilda, Capreol, Chelmsford, Coniston, Dowling, Lively and Valley East).