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.

In Argentina

In Bolivia

In Brazil

In Canada

Stations in bold are clear-channel stations.

In Chile

In Costa Rica

In Colombia

In Cuba

In Ecuador

In France

In Guadeloupe

In Guatemala

In Honduras

In Mexico

In Panama

In Paraguay

In Peru

In the United States

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.

In Venezuela