Pefferlaw, ON utilizes an area code overlay in which area codes 705 and 249 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary 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. The area code overlay was put into service in 2011 when area code 705 was overlaid with area code 249.
In addition to Pefferlaw, ON area codes 705 and 249 cover portions of northeastern and central Ontario, including the larger communities of Barrie, Bracebridge, Collingwood, Greater Sudbury, Haliburton, Hearst, Huntsville, Lindsay, Midland, North Bay, Orillia, Peterborough, Sault Ste. Marie, Timmins, and Temiskaming Shores in addition to many smaller communities within the service area.