Human settlement in England Barnard Castle Part of Barnard Castle Market Place showing the "Market Cross" or "Butter Market" Barnard Castle Location within County Durham Population 5,495 (2011)[1] OS grid reference NZ047166 Unitary authority County Durham Ceremonial county County Durham Region North East Country England Sovereign state United Kingdom Post town BARNARD CASTLE Postcode district DL12 Dialling code 01833 Police Durham Fire County Durham and Darlington Ambulance North East UK Parliament Bishop Auckland List of places UK England County Durham 54°33′N 1°55′W﻿ / ﻿54.55°N 1.92°W﻿ / 54.55; -1.92Coordinates: 54°33′N 1°55′W﻿ / ﻿54.55°N 1.92°W﻿ / 54.55; -1.92