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640 AM - The followingradio stations broadcast onAM frequency 640kHz:[1] 640 AM is a North Americanclear-channel frequency.[2]KFI in Los Angeles, California,KYUK in Bethel, Alaska, andCBN in St. John's, Newfoundland and Labrador, shareClass A status of 640 AM.
Stations inbold areclear-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″N95°52′21″W / 68.6267°N 95.8725°W /68.6267; -95.8725 (CBIA - 0.04 kW daytime, 0.04 kW nighttime) |
| CBN | St. John's, Newfoundland and Labrador | 10 | 10 | 47°34′08″N52°48′45″W / 47.568889°N 52.8125°W /47.568889; -52.8125 (CBN - 10 kW daytime, 10 kW nighttime) |
| CFIQ | Richmond Hill, Ontario | 50 | 50 | 43°10′45″N79°25′59″W / 43.179167°N 79.433056°W /43.179167; -79.433056 (CFMJ - 50 kW daytime, 50 kW nighttime) |
Stations inbold areclear-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 being1240 AM.