 Sankt Julian borders in the north on the municipality of Kirrweiler, in the northeast on the municipality of Deimberg, in the east on the municipality of Glanbrücken, in the southeast on the municipality of Horschbach, in the south on the municipality of Welchweiler, in the southwest on the municipality of Ulmet, in the west on the municipality of Niederalben and in the northwest on the Baumholder troop drilling ground.Sankt Julian also meets the municipality of Bedesbach at a single point in the south.Sankt Julian’s "Ortsteile" are the main centre, likewise called Sankt Julian, Eschenau, Gumbsweiler and Obereisenbach.