For other stations that used the KFI callsign, please see KFI (disambiguation).KFI is an AM radio station in Los Angeles, California, owned and operated by iHeartMedia, Inc. It received its license to operate on March 31, 1922 and began operating on April 16, 1922, and after a succession of power increases, became one of the United States' first high-powered, "clear-channel" stations. KFI, which broadcasts on 640 AM, is the dominant class A 50,000 watt station in North America.