Casar, North Carolina. Casar is a small town in northern Cleveland County, North Carolina, United States. The population was 297 at the 2010 census. Casar is located at 35°30′52″N 81°36′58″W / 35.51444°N 81.61611°W / 35.51444; -81.61611 (35.514486, -81.616007).