Omsica is located in the municipality Gračac, in Zadar County at an elevation of 734 meters above sea level and it covers the area of 18.92 km² (7.31 sq. miles). According to the 2011 census report, there were 16 inhabitants. It is entirely populated by Serbs. Nearby places: Gubavčevo Polje, Kijani, Glogovo, Deringaj, Bruvno, Tomingaj, Dabašnica, Grab, Rudopolje Bruvanjsko and Vučipolje.