 Rothselberg borders in the northeast on the municipality of Rutsweiler an der Lauter, in the east on the municipality of Kreimbach-Kaulbach, in the southeast on the municipality of Frankelbach, in the southwest on the municipality of Kollweiler, in the west on the municipality of Jettenbach and in the northwest on the municipality of Eßweiler.Rothselberg also meets the municipalities of Erzenhausen and Sulzbachtal at a single point in the south.Rothselberg's "Ortsteile" are the main centre, likewise called Rothselberg, and the outlying homestead of the Sonnenhof.