County Roscommon (Irish: Contae Ros Comáin) is a county in Ireland. It is located in the province of Connacht, and also the West Region.
It is named after the town of Roscommon. Roscommon comes from the Irish Ros meaning a wooded, gentle height and Comán, the name of the founder, first abbot and bishop of Roscommon. Roscommon County Council is the local authority for the county. The population of the county is 64,065 according to the 2010 census.
Roscommon is the 9th largest of the 32 counties of Ireland by area and the 5th least-populous county in Ireland. It has an area of 984 square miles It has the 2nd least population density after Leitrim. It is the 3rd largest of Connacht’s 5 counties by size & 4th largest in terms of population.