Thornhill Area Codes, Ontario, Canada
How to call Thornhill, Ontario?
Thornhill has 1 area code. To call Thornhill you need to dial the Canada country code (+1) and the following area code:
905How to know if I'm receiving calls from Thornhill, Ontario?
You are receiving calls from Thornhill when the phone number starts with the following combination:
1-905Other area codes in Canada
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