Measurements of indoor radon have a critical role in monitoring human health and safety. In this study, measurements of radon in the houses of Bingöl and Mus provinces and in their surrounding villages were performed by using CR-39 nuclear track detectors. Bingöl and Mus Provinces of Turkey have the severe terrestrial climate with hot and dry summers and cold and snowy winters for a long period. Therefore, people who spend much of their time at home have a greater risk for being exposed.