Frkašić is located in the municipality Udbina, in Lika-Senj County at an elevation of 689 meters above sea level and it covers the area of 20.35 km² (7.86 sq. miles). According to the 2011 census report, there were 31 inhabitants. It is predominantly populated by Serbs (93%), but also. Nearby places: Klašnjica, Vedašić, Bjelopolje, Ponor Korenički, Tuk Bjelopoljski, Grabušić, Jasikovac, Pećane, Gradina Korenička and Oravac.