640 AM
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
- LRA24 in Río Grande, Tierra del Fuego
- LU18 in General Roca, Río Negro
- LV15 in Villa Mercedes, San Luis
In Bolivia
- CP 157 in Milluni
In Brazil
- ZYH458 in Itabuna
- ZYH-757 in Goiânia
- ZYI-240 in Vitória·
- ZYI-418 in Alta Floresta
- ZYJ262 in Londrina
- ZYJ-489 in Resende
- ZYJ590 in Natal, Rio Grande do Norte
- ZYK-277 in Porto Alegre
- ZYK-547 in Araraquara
- ZYL-308 in Para de Minas
In Canada
| Call sign | City of license | Daytime power | Nighttime power | Transmitter coordinates |
| CBIA | Gjoa Haven, Nunavut | 0.04 | 0.04 | |
| CBN | St. John's, Newfoundland and Labrador | 10 | 10 | |
| CFIQ | Richmond Hill, Ontario | 50 | 50 |
In Chile
- CA-064 in Curico
- CD-064 in Temuco
In Costa Rica
- TIQQ in San José
In Colombia
- HJBJ in Santa Marta
- HJR32 in Bucaramanga
In Cuba
- CMLA in Victoria de Las Tunas
In Ecuador
- HCXY1 in Quito
In France
In Guadeloupe
- FFQ in Point-à-Pitre
In Guatemala
- TGW in Guatemala City
In Honduras
- HRNN4 in Tegucigalpa
In Mexico
- XELOVE-AM in Cd. Juárez, Chihuahua
- XENQ-AM in Tulancingo, Hidalgo
- XETAM-AM in Santa Elena, Tamaulipas
In Panama
- HOK 22 in Colón
In Paraguay
- ZP 19 in Coronel Oviedo
In Peru
- OAZ4K in Lima
In the United States
| Call sign | City of license | Facility ID | Class | Daytime power | Nighttime power | Unlimited power | Transmitter coordinates |
| KFI | Los Angeles, California | 34425 | A | 50 | 50 | ||
| KTIB | Thibodaux, Louisiana | 36183 | B | 5 | 1 | ||
| KWPN | Moore, Oklahoma | 22190 | B | 5 | 1 | ||
| KYUK | Bethel, Alaska | 4963 | A | 10 | |||
| WBIN | Atlanta, Georgia | 29730 | B | 50 | 1 | ||
| WCRV | Collierville, Tennessee | 6486 | B | 50 | 0.48 | ||
| WFNC | Fayetteville, North Carolina | 8583 | B | 10 | 1 | ||
| WHLO | Akron, Ohio | 43858 | B | 5 | 0.5 | ||
| WMEN | Royal Palm Beach, Florida | 61080 | B | 7.5 | 0.46 | ||
| WMFN | Peotone, Illinois | 55089 | B | 4.4 | 1.6 | ||
| WNNZ | Westfield, Massachusetts | 9736 | B | 50 | 1 | ||
| WOI | Ames, Iowa | 29119 | B | 5 | 1 | ||
| WVLG | Wildwood, Florida | 70724 | B | 0.93 | 0.86 | ||
| WWJZ | Mount Holly, New Jersey | 43904 | B | 50 | 0.95 | ||
| WXSM | Blountville, Tennessee | 29513 | B | 10 | 0.81 |
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
- YVSI in Maracaibo
- YVQO in Puerto La Cruz