The following radio stations broadcast on AM frequency 1640 kHz: 1640 AM is a Regional broadcast frequency.[1] __TOC__
All stations operate with 10 kW during the daytime and are Class B stations.
| City of license | Facility | Nighttime power (kW) | Transmitter coordinates | ||
|---|---|---|---|---|---|
| Sandy, Utah | 87119 | 1 | 40.7131°N -111.9314°W | ||
| Vallejo, California | 87108 | 10 | 37.8956°N -122.3242°W (daytime) 38.1342°N -122.4256°W (nighttime) | ||
| Lake Oswego, Oregon | 86618 | 1 | 45.4539°N -122.5464°W | ||
| Enid, Oklahoma | 87168 | 1 | 36.1153°N -97.7564°W | ||
| Sussex, Wisconsin | 87121 | 1 | 43.0772°N -88.1922°W | ||
| Biloxi, Mississippi | 87159 | 1 | 30.4742°N -88.8564°W |