WNZK is a radio station in Dearborn Heights, Michigan, United States. WNZK began broadcasting October 12, 1985, with the western Detroit suburb of Westland as its city of license; it switched to Dearborn Heights by 1990. According to the FCC online database, WNZK is the only AM radio station in North America on two frequencies: 690 kHz during the daytime and at 680 kHz at night. This is to protect the nighttime pattern of Montreal, Quebec's CKGM, a clear-channel station on 690.