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County Down (Irish: Contae an Dúin) is one of six counties that form Northern Ireland, in the northeast of the island of Ireland. It covers an area of 2,448 km2 (945 sq mi) and has a population of 531,665. It is also one of the thirty-two traditional counties of Ireland and is within the province of Ulster. It borders County Antrim to the north, the Irish Sea to the east, County Armagh to the west, and County Louth across Carlingford Lough to the southwest.

In the east of the county is Strangford Lough and the Ards Peninsula. The largest town is Bangor, on the northeast coast. Three other large towns and cities are on its border: Newry lies on the western border with County Armagh, while Lisburn and Belfast lie on the northern border with County Antrim. Down contains both the southernmost point of Northern Ireland (Cranfield Point) and the easternmost point of Ireland (Burr Point).

It was one of two counties of Northern Ireland to have a Protestant majority at the 2001 census. The other Protestant majority County is County Antrim to the North.

In March 2018, The Sunday Times published its list of Best Places to Live in Britain, including five in Northern Ireland. The list included three in County Down: Holywood, Newcastle, and Strangford.

Border location has been derived from river positions and address lookups.  There may be some variation in the actual position, particularly between points, most notably around Portadown and Lurgan.