The 10th largest city in Canada. London, Ontario is located close to Toronto (in the southern part of the province of Ontario). It is also referred to as "The Forest City" for its amount of trees and plant growth. Londoners tend to travel around every part of the city, and have no fear of being out late in the middle of no where.
If someone asks a Londoner (Ontarian) where they live, and they reply with "I live in London", they will most likely assume they live in England because no one knows of the one in Ontario.
Person 1: So where do you live?
Person 2: London. :)
Person 1: Ooh, I love English accents.
Person 2: Umm, I'm not British. o.o I live in Canada.
Person 1: But you just said you live in London.
Person 2: Yeah, London ONTARIO.
Person 1: Oh, I never knew Canada had a London.