Area Code 437 History:
Area code 437 was put into service. Area code 437 is an overlay of area codes area codes 416 and 647.
Ten digit dialing (area code + seven digit number) is necessary in the 416/647/437 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
Major cities or places in Ontario within area code 437 include:
When implemented the area code overlays of 416, 437 and 647 will serve the City of Toronto. The surrounding suburbs are served by area code 905.