840 AM
The following radio stations broadcast on AM frequency 840 kHz: WHAS in Louisville, Kentucky is the dominant Class A, clear-channel station on 840 AM, which is a United States clear channel frequency.
In Argentina
- General Belgrano in Buenos Aires
- LT12 Gral Madariaga in Paso de los Libres, Corrientes
- LU2 in Bahia Blanca, Buenos Aires
- LV9 in Salta
In Canada
In Mexico
- XEMY-AM in Cd. Mante, Tamaulipas
- XETEY-AM in Tepic, Nayarit
- XEXXX-AM in Tamazula de Gordiano, Jalisco
In the United States
| Call sign | City of license | Day kW | Night kW | Transmitter coordinates |
| KJFA | Belen, New Mexico | 1.8 | 0.03 | |
| Eugene, Oregon | 1 | 0.17 | ||
| KMAX | Colfax, Washington | 10 | 0.28 | |
| KMPH | Modesto, California | 5 | 5 | |
| KSWB | Seaside, Oregon | 1 | 0.5 | |
| KTIC | West Point, Nebraska | 5 | 0 | |
| Pharr, Texas | 5 | 1 | ||
| Ball, Louisiana | 8 | 0 | ||
| KXNT | North Las Vegas, Nevada | 50 | 25 | |
| WBHY | Mobile, Alabama | 10 | 0 | |
| WCEO | Columbia, South Carolina | 50 | 0 | |
| WHAS | Louisville, Kentucky | 50 | 50 | |
| Denton, Maryland | 1 | 0 | ||
| Earlysville, Virginia | 8.2 | 0 | ||
| Mims, Florida | 1 | 0 | ||
| New Britain, Connecticut | 1 | 0.125 | ||
| Stroudsburg, Pennsylvania | 0.25 | 0 | ||
| Yabucoa, Puerto Rico | 5 | 1 |