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The following radio stations broadcast on AM frequency 1640 kHz: 1640 AM is a Regional broadcast frequency.[1]
All stations operate with 10 kW during the daytime and are Class B stations.
| Call sign | City of license | Facility | Nighttime power (kW) | Transmitter coordinates |
|---|---|---|---|---|
| KBJA | Sandy, Utah | 87119 | 1 | 40°42′47″N 111°55′53″W / 40.713056°N 111.931389°W |
| KDIA | Vallejo, California | 87108 | 10 | 37°53′44″N 122°19′27″W / 37.895556°N 122.324167°W (daytime) 38°08′03″N 122°25′32″W / 38.134167°N 122.425556°W (nighttime) |
| KDZR | Lake Oswego, Oregon | 86618 | 1 | 45°27′14″N 122°32′47″W / 45.453889°N 122.546389°W |
| KZLS | Enid, Oklahoma | 87168 | 1 | 36°06′55″N 97°45′23″W / 36.115278°N 97.756389°W |
| WSJP | Sussex, Wisconsin | 87121 | 1 | 43°04′38″N 88°11′32″W / 43.077222°N 88.192222°W |
| WTNI | Biloxi, Mississippi | 87159 | 1 | 30°28′27″N 88°51′23″W / 30.474167°N 88.856389°W |