| Area Code: | DL |
The DL postcode area, also known as the Darlington postcode area,[1] is a group of seventeen postcode districts in England, which are subdivisions of fourteen post towns. These districts cover central County Durham (including Darlington, Bishop Auckland, Ferryhill, Crook, Spennymoor, Shildon, Barnard Castle and Newton Aycliffe), northern North Yorkshire (including Northallerton, Bedale, Hawes, Leyburn, Richmond and Catterick Garrison) and a very small part of Cumbria.
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The approximate coverage of the postcode districts:
|-! DL1| DARLINGTON| Darlington (east)| Darlington|-! DL2| DARLINGTON| Staindrop, Gainford, Darlington new estates| County Durham, Darlington|-! DL3| DARLINGTON| Darlington (west), Faverdale, Coatham Mundeville| Darlington|-! DL4| SHILDON| Shildon| County Durham|-! DL5| NEWTON AYCLIFFE| Newton Aycliffe, Heighington| County Durham|-! DL6| NORTHALLERTON| Northallerton (east), Ingleby Cross| North Yorkshire|-! DL7| NORTHALLERTON| Northallerton (west), Romanby, Leeming Bar| North Yorkshire|-!rowspan=3|DL8| BEDALE| Bedale| North Yorkshire|-| HAWES| Hawes| North Yorkshire|-| LEYBURN| Coverham, Leyburn, Middleham| North Yorkshire|-! DL9| CATTERICK GARRISON| Catterick Garrison| North Yorkshire|-! DL10| RICHMOND| Richmond, Catterick, Brompton-upon-Swale, Scotch Corner| North Yorkshire|-! DL11| RICHMOND| Swaledale, Reeth, Low Row, Arkengarthdale| North Yorkshire, Westmorland and Furness|-! DL12| BARNARD CASTLE| Barnard Castle, Bowes, Middleton-in-Teesdale| County Durham|-! DL13| BISHOP AUCKLAND| Stanhope, Frosterley, Wolsingham, Tow Law| County Durham, Westmorland and Furness|-! DL14| BISHOP AUCKLAND| Bishop Auckland, Evenwood| County Durham|-! DL15| CROOK| Crook, Willington| County Durham|-! DL16| SPENNYMOOR| Spennymoor| County Durham|-! style="background:#FFFFFF;"|DL16| style="background:#FFFFFF;"|FERRYHILL| style="background:#FFFFFF;"|| style="background:#FFFFFF;"|non-geographic[2] [3] |-! DL17| FERRYHILL| Ferryhill, Chilton, Cornforth, Bishop Middleham| County Durham|-! style="background:#FFFFFF;"|DL98| style="background:#FFFFFF;"|DARLINGTON| style="background:#FFFFFF;"|| style="background:#FFFFFF;"|non-geographic[4] |}