County Longford (Irish: Contae an Longfoirt) is a county in Ireland. It is part of the Midlands Region and is in the province of Leinster. It is named after the town of Longford. Longford County Council is the local authority for the county. The population of the county is 40,810 according to the 2016 census.

With an area of 1,091 km² (421 sq mi) and a population of 40,810, Longford is the fourth smallest of the 32 counties in area and second smallest in terms of population. It is also the fourth smallest of Leinster’s 12 counties by size and smallest by population. It borders counties Cavan to the northeast, Westmeath to the east and southeast, Roscommon to the west and southwest and Leitrim to the northwest.

Most of Longford lies in the basin of the River Shannon with Lough Ree forming much of the county's western boundary. The north-eastern part of the county, however, drains towards the River Erne and Lough Gowna. Lakeland, bogland, pastureland, and wetland typify Longford's generally low-lying landscapes: the highest point of the county is in the north-west - Carn Clonhugh (also known as Cairn Hill) near Drumlish at 279 m (916 feet). Cairn Hill is the site of a television transmitter broadcasting to much of the Irish midlands.

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