| Postcode | Coverage Area |
| DH1 | Durham |
| DH2 | Chester-le-street(West Ofeast Coast Main Line), Ouston, Pelton, Birtley (West Of East Coast Main Line) |
| DH3 | Chester-le-street (East Of East Coast Main Line),Great Lumley,Birtley(East Of East Coast Main Line) |
| DH4 | Houghton Le Spring(West Of A690),Penshaw,Shiney Row |
| DH6 | South Hetton,Haswell,Shotton Colliery,Ludworth,Shadforth,Sherburn, Littletown, Kelloe,Coxhoe,Bowburn,Cassop, Pittington,Thornley, Wheatly Hill |
| DH7 | Brandon,Lanchester,Esh Winning,Burnhope, Langley Park,Sacriston,Ushaw Moor,Brancepeth |
| DH8 | Consett, Blackhill, Bridgehill, Shotley Bridge, Leadgate, Delves Lane |
| DH9 | Dipton,Stanley,Annfield Plain |
| DL2 | Staindrop,Gainford& Darlington New Estates |
| DL4 | Shildon |
| DL5 | Newton Aycliffe&heighington |
| DL12 | Barnard Castle,Bowes&middleton-in-teesdale |
| DL13 | Stanhope,Frosterley,Wolsingham&tow Law |
| DL14 | Bishop Auckland&evenwood |
| DL15 | Crook&willington |
| DL16 | Spennymoor |
| DL17 | Ferryhill,Chilton,Cornforth&bishop Middleham |
| NE16 | Whickham, Sunniside,Burnopfield |
| NE39 | Rowlands Gill, High Spen, Hamsterley Mill, Eastern Chopwell Wood |
| SR7 | Cold Hesledon,Dalton-le-dale,Dawdon,Deneside,Greenhill,Murton,Northlea,Parkside,Seaham,West Lea |
| SR8 | Easington,Easington Colliery,Horden,Little Thorpe,Peterlee |
| TS27 | Blackhall Rocks,Blackhall Colliery,Castle Eden,Hesleden,High Hesleden,Hutton Henry |
| TS28 | Wingate,Station Town |
| TS29 | Trimdon |