640 AM - The following radio stations broadcast on AM frequency 640 kHz: 640 AM is a North American clear-channel frequency. KFI in Los Angeles, California, KYUK in Bethel, Alaska, and CBN in St. John's, Newfoundland and Labrador, share Class A status of 640 AM.
Stations in bold are clear-channel stations.
Stations in bold are clear-channel stations.
Between 1951 and 1963, the frequency was also one of two used for the United States' CONELRAD emergency broadcasting system, the other frequency being 1240 AM.