CFMJ is a Canadian radio station, broadcasting at 640 kHz on the AM dial. It is officially licensed to Richmond Hill, Ontario, but the studio is in the Corus Quay building, located at 125 Queens Quay East in Toronto. The station airs a talk radio and sports format targeted to the entire Greater Toronto Area.
CFMJ transmits with an eight-tower directional antenna; although it is a Toronto market station that is licensed to a suburb located to the north of the city, its transmitter is actually located in the town of Lincoln, in Niagara Region, near the southeast corner of Greenlane and Merritt Road. This location allows the station's 50,000–watt signal to cover a large portion of Southern Ontario beyond Greater Toronto, as well as western New York state, both during the day and at night.