840 AM
The following radio stations broadcast on AM frequency 840 kHz: WHAS in Louisville is the dominant Class A 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
- XETEY-AM in Tepic, Nayarit
- XEXXX-AM in Tamazula de Gordiano, Jalisco
In the United States
| Call sign | City of license | Facility ID | Class | Daytime power | Nighttime power | Unlimited power | Transmitter coordinates |
| KDNF | Belen, New Mexico | 25528 | D | 1.8 | 0.03 | ||
| KKNX | Eugene, Oregon | 5390 | D | 1 | 0.17 | ||
| KMAX | Colfax, Washington | 13569 | B | 10 | 0.28 | ||
| KMPH | Modesto, California | 137401 | B | 5 | 5 | ||
| KPEN | Kenai, Alaska | 160571 | B | 5 | 1.9 | ||
| KSWB | Seaside, Oregon | 43580 | B | 1 | 0.5 | ||
| KTIC | West Point, Nebraska | 33880 | D | 5 | |||
| KVJY | Pharr, Texas | 64629 | B | 5 | 1 | ||
| KWDF | Ball, Louisiana | 3641 | D | 8 | |||
| KXNT | North Las Vegas, Nevada | 33068 | B | 50 | 25 | ||
| WBHY | Mobile, Alabama | 24453 | D | 10 | |||
| WCEO | Columbia, South Carolina | 54466 | D | 50 | |||
| WHAS | Louisville, Kentucky | 11934 | A | 50 | |||
| WHGH | Thomasville, Georgia | 25773 | D | 10 | |||
| WKDI | Denton, Maryland | 4131 | D | 1 | |||
| WKTR | Earlysville, Virginia | 73191 | D | 8.2 | |||
| WPCO | Stroudsburg, Pennsylvania | 47423 | D | 0.25 | |||
| WPGS | Mims, Florida | 73876 | D | 1 | |||
| WRYM | New Britain, Connecticut | 26314 | D | 1 | 0.125 | ||
| WXEW | Yabucoa, Puerto Rico | 74206 | B | 5 | 1 |