KSJB is an AM radio station based in Jamestown in the U.S. state of North Dakota.
Broadcasting at 600 kHz with 5,000 watts of power and a directional pattern that drives the signal from northeast to southwest, the station boasts that it can be heard clearly in six states and two Canadian provinces. KSJB can be heard with a clear "city-grade" signal in cities such as Valley City, Bismarck, Fargo, Grand Forks, Minot, Pierre, South Dakota, Winnipeg, Manitoba, Canada and Bemidji, Minnesota.
Both KSJB and KSJZ broadcast from studios at the Buffalo Mall. They share a transmitter site south of Jamestown, on Highway 281.