Area Code Lookup
What Area Code Is Thornhill?
Area code 905 · Ontario
Thornhill uses area code 905. It is located in Ontario.
Area Code Serving Thornhill
Frequently Asked Questions
What area code is Thornhill?
Thornhill uses area code 905. It is located in Ontario.
How do I call Thornhill from outside the US?
To call Thornhill from abroad, dial +1 followed by the area code and 7-digit local number (e.g. +1-905-XXX-XXXX). The +1 is the country code for all NANPA countries.