County Durham & Darlington

  Key Postcode Districts DL Area (County Durham).

· DL1 -  Central Darlington, Eastbourne, Harrowgate Hil - 31,563 

· DL2 -  Staindrop, Gainford, and newer estates - 7,328

· DL3:  Western Darlington, Cockerton, Faverdale - 19,893 

· DL4: Shildon - 4,995

· DL5: Newton Aycliffe- 12,03

· DL6 to DL7: Northallerton- 5,047

· DL8: Bedale, Hawes, Leyburn - 3,327

· DL9: Catterick Garrison - 4,568

· DL10: Richmond - 8,045

· DL11: Richmond - 2,987

· DL12: Barnard Castle - 2,790

· DL13 to DL14: Bishop Auckland - 23,017

· DL15: Crook - 5,676

· DL16: Spennymoor, Ferryhill -  8,867  

· DL17: Ferryhill - 8,155 (which covers Ferryhill, Chilton, Cornforth, and Bishop Middleham)

  Key Postcode Districts DH Area (Durham)

• DH1: Durham - 18,867

• DH2: Chester-le-Street - 13,551

• DH3: Chester-le-Street - 11,465

• DH4: Houghton-le-Spring - 14,000 to 15,000

• DH5: Houghton-le-Spring - 10,541

• DH6: Durham - 22,974

• DH7: Durham - 23,027

• DH8: Consett and Stanley - 16,986

• DH9: Stanley - 16,480 (Dipton and Annfield Plain)

(Approximate fiqures provided by ONS Census data.)