County Londonderry
![](/Images/godic/202501/24/Lderry_arms.svg4835.png")
![](/Images/godic/202501/24/Island_of_Ireland_location_map_Londonderry.svg4835.png")
![A cannon sits atop the historic Derry Walls, which look over Derry City.](/Images/godic/202501/24/Cannon_on_Derry_City_Walls_SMC_20074836.jpg")
![Map of County Londonderry, 1837](/Images/godic/202501/24/1837Londonderry4836.jpg")
County Londonderry, also known as County Derry (Irish: Contae Dhoire, Ulster Scots: Coontie Lunnonderrie), is one of the six counties of Northern Ireland. Adjoining the north-west shore of Lough Neagh, the county covers an area of 2,074 km² (801 sq mi) and has a population of about 247,132. It is also one of the nine (of a total of thirty-two) traditional counties of Ireland, lying within the historic province of Ulster.