The following radio stations broadcast on AM frequency 550 kHz,[1] which the Federal Communications Commission classifies as a regional frequency.[2]
| City of license | Facility ID | Class | Daytime power (kW) | Nighttime power (kW) | Transmitter coordinates | ||
|---|---|---|---|---|---|---|---|
| Blaine, Washington | 5351 | B | 5 | 2.5 | 48.9542°N -122.7433°W | ||
| Butte, Montana | 7911 | B | 5 | 1 | 45.975°N -112.5717°W | ||
| Midland, Texas | 42015 | B | 5 | 1 | 32.0694°N -102.0294°W | ||
| Salina, Kansas | 25808 | D | 5 | 0.11 | 39.4344°N -97.6603°W | ||
| Phoenix, Arizona | 63918 | B | 5 | 1 | 33.3881°N -112.0061°W | ||
| Bismarck, North Dakota | 41426 | B | 5 | 5 | 46.8533°N -100.5436°W | ||
| Breen, Colorado | 15879 | D | 1.8 | 37.1839°N -108.0817°W | |||
| Wailuku, Hawaii | 49956 | B | 5 | 5 | 20.8906°N -156.4889°W | ||
| Corvallis, Oregon | 50587 | B | 5 | 5 | 44.6367°N -123.1925°W | ||
| Craig, Colorado | 72436 | B | 5 | 0.5 | 40.5458°N -107.5311°W | ||
| Saint Louis, Missouri | 20359 | B | 5 | 5 | 38.6625°N -90.1286°W | ||
| San Antonio, Texas | 71087 | B | 5 | 5 | 29.4947°N -98.4144°W (daytime) 29.4961°N -98.415°W (nighttime) | ||
| Anchorage, Alaska | 12967 | B | 3.1 | 5 | 61.1661°N -149.8261°W | ||
| Bakersfield, California | 7695 | B | 5 | 5 | 35.3403°N -118.9386°W | ||
| Statesville, North Carolina | 63146 | D | 0.5 | 0.053 | 35.7933°N -80.8542°W | ||
| Fleming Island, Florida | 24625 | B | 5 | 0.5 | 30.0725°N -81.79°W | ||
| Waterbury, Vermont | 54866 | B | 5 | 1 | 44.3547°N -72.7519°W | ||
| Gainesville, Georgia | 32976 | B | 10 | 2.5 | 34.3356°N -83.7922°W | ||
| Buffalo, New York | 56101 | B | 5 | 5 | 42.7697°N -78.8436°W | ||
| Pinehurst, North Carolina | 46949 | B | 1 | 0.26 | 35.1511°N -79.4778°W | ||
| Cincinnati, Ohio | 29737 | B | 5 | 1 | 39.0081°N -84.4442°W | ||
| Ponce, Puerto Rico | 53077 | B | 5 | 5 | 17.9908°N -66.63°W | ||
| Wausau, Wisconsin | 41902 | B | 15 | 20 | 44.8572°N -89.5869°W | ||
| Pawtucket, Rhode Island | 67578 | B | 1 | 0.5 | 41.905°N -71.3994°W | ||
| Harrisonburg, Virginia | 39493 | B | 5 | 1 | 38.4511°N -78.9081°W |