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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.
| Call sign | City of license | Daytime power (kW) | Nighttime power (kW) | Transmitter coordinates |
|---|---|---|---|---|
| CBIA | Gjoa Haven, Nunavut | 0.04 | 0.04 | 68°37′36″N 95°52′21″W / 68.6267°N 95.8725°W |
| CBN | St. John's, Newfoundland and Labrador | 10 | 10 | 47°34′08″N 52°48′45″W / 47.568889°N 52.8125°W |
| CFIQ | Richmond Hill, Ontario | 50 | 50 | 43°10′45″N 79°25′59″W / 43.179167°N 79.433056°W |
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.