There are two townlands called Leitrim in South Down, one is referred to as Upper Leitrim, the other, as Lower Leitrim. One being closer to Hilltown, the other approximately 6 miles from Castlewellan, near Dromara. It is set between the Dromara Hills (Slieve Croob) and the Mourne Mountains. It is claimed to be home to the MacCartan clan of Kinelarty.