Entry in progress—B.P.
 
Other Toronto nicknames include “Big Smoke,” “Broadway North,” “Centre of the Universe,” “Hogtown,” “Hollywood North,” “Little Apple.” “Muddy York,” “New York of the North,” “New York Run by the Swiss,” “Queen City,” “T-Dot,” “The Six” and “Toronto the Good.”
 
 
Wikipedia: Toronto 
Toronto is the provincial capital of Ontario and the most populous city in Canada, with a population of 2,731,571 in 2016. Current to 2016, the Toronto census metropolitan area (CMA), of which the majority is within the Greater Toronto Area (GTA), held a population of 5,928,040, making it Canada’s most populous CMA. Toronto is the anchor of an urban agglomeration, known as the Golden Horseshoe in Southern Ontario, located on the northwestern shore of Lake Ontario. A global city, Toronto is a centre of business, finance, arts, and culture, and is recognized as one of the most multicultural and cosmopolitan cities in the world.
       
Wikipedia: Name of Toronto
“TO” or “T.O.”, from Toronto, Ontario, or from Toronto; pronounced “Tee-Oh”. Sometimes used as T-dot.
 
Urban Dictionary
TO
Abbreviation for Toronto, Ontario, Canada.
See also tdot.
Lucky Dragon has the best General Tso’s Chicken in TO.
by Silly Dan November 30, 2002
 
Urban Dictionary
t.o.
Slang for Toronto
yo where goin to t.o to smoke some weed.
by hue geass October 12, 2003