Toronto is a world-class city with a population of 2.6 million in the actual city of Toronto.
The subburbs (Thornhill, Ajax, Mississagua, etc) have double the amount of the city. This area is referred to by locals at GTA (Greater Toronto Area). The GTA hosts a population of 6.4 million.
The GTA is built around Lake Ontario. This region is home to other cities. One can drive from Oshawa to Niagara falls (2.5 hours in non-rush hour) and be in continual city. This region is known as 'The Golden Horseshoe' or 'Greater Golden Horseshoe'.
The population of the Golden Horseshoe is currently around 10 million people.
Suburban Cities within the Golden Horseshoe are (East to West to South):
Bowmanville, Courtice, Oshawa, Whitby, Ajax, Pickering, Toronto, Markham, Richmond Hill, Newmarket, Vaughn, Caledon, Brampton, Mississauga, Milton, Oakville, Burlington, Hamilton, Grimsby, St. Catherines, Niagara Falls
The population of Ubisoft Toronto is 120.
Old Toronto's population is 736,775.
The population of Toronto Bicycling Network is 0.
The population of Toronto-Dominion Bank is 2,011.
The population of Toronto-Dominion Bank is 75,631.
The population of Toronto Cyclists Union is 0.
The population of Greater Toronto Airports Authority is 1,104.
The population of Toronto Coalition for Active Transportation is 1.
The latest census (2006) put Toronto's population as 2,500,000 which is good for the fourth largest city in North America. Toronto's website pegs the city's population at 2,700,000. Toronto's population density is 3,972/km2 as of the latest census and the city covers 630 km2.
The population of Toronto-Dominion Bank is 75,631.
Toronto's population is more diverse than any other city on Earth.
The population of Toronto in 2012 is 2.6 Million. If you like this answer- follow me on Twitter- @DiamondTaurus27