Slivnica is inhabited by Orthodox Macedonians.[2] During the late Ottoman period, Torbeš also used to reside in Slivnica.[3] The statistics of Bulgarian ethnographer Vasil Kanchov from 1900 also verifies this. In his statistics Slivnica had 126 inhabitants with 120 being Bulgarian Exarchists and 6 being Bulgarian Muslims.[4]
Slivnica has a population of 188 people.[5] It is one of only four villages in Resen Municipality that saw a population increase from the 1994 census to the most recent one in 2002.[6]
^Włodzimierz, Pianka (1970). Toponomastikata na Ohridsko-Prespanskiot bazen. Institut za makedonski jazik "Krste Misirkov". pp. 128–129. "Горна Преспа... Во Подмочани и Сливница (сега само Македонци) имало Македонци - муслимани."