select entry in Code column to view full DE allocations in that range
| Code | DEF | Operator | Use | Notes |
| 1300 | Cerne Abbas | |||
| 1301 | Arrochar | |||
| 1302 | Doncaster | |||
| 1303 | Folkestone | |||
| 1304 | Dover | |||
| 1305 | Dorchester | |||
| 1306 | Dorking | |||
| 1307 | Forfar | |||
| 1308 | Bridport | |||
| 1309 | Forres | |||
| 1310, 1311 | Edinburgh National dialling | |||
| 1312, 1313, 1314, 1315, 1316, 1317, 1318 | Edinburgh | |||
| 1319 | Edinburgh expansion | |||
| 1320 | Fort Augustus | |||
| 1321 | Geographic - unassigned | |||
| 1322 | Dartford | |||
| 1323 | Eastbourne | |||
| 1324 | Falkirk | |||
| 1325 | Darlington | |||
| 1326 | Falmouth | |||
| 1327 | Daventry | |||
| 1328 | Fakenham | |||
| 1329 | Fareham | |||
| 1330 | Banchory | |||
| 1331 | Geographic - unassigned | |||
| 1332 | Derby | |||
| 1333 | Peat Inn | |||
| 1334 | St Andrews | |||
| 1335 | Ashbourne | |||
| 1336 | Geographic - unassigned | |||
| 1337 | Ladybank | |||
| 1338 | Geographic - unassigned | |||
| 1339 | 0&1 | Aboyne/Ballater National Dialling | ELNS | |
| 1339 | 2&3 | Aboyne | ELNS | |
| 1339 | 4 | Ballater | ELNS | |
| 1339 | 5 | Aboyne | ELNS | |
| 1339 | 6&7 | Ballater | ELNS | |
| 1339 | 8 | Aboyne | ELNS | |
| 1339 | 9 | Ballater | ELNS | |
| 1340 | Craigellachie | |||
| 1341 | Barmouth | |||
| 1342 | East Grinstead | |||
| 1343 | Elgin | |||
| 1344 | Bracknell | |||
| 1345 | Geographic - unassigned | |||
| 1346 | Fraserburgh | |||
| 1347 | Easingwold | |||
| 1348 | Fishguard | |||
| 1349 | Dingwall | |||
| 1350 | Dunkeld | |||
| 1351 | Geographic - unassigned | |||
| 1352 | Mold | |||
| 1353 | Ely | |||
| 1354 | Chatteris | |||
| 1355 | East Kilbride | |||
| 1356 | Brechin | |||
| 1357 | Strathaven | |||
| 1358 | Ellon | |||
| 1359 | Pakenham | |||
| 1360 | Killearn | |||
| 1361 | Duns | |||
| 1362 | Dereham | |||
| 1363 | Crediton | |||
| 1364 | Ashburton | |||
| 1365 | Geographic - unassigned (formerly Enniskillen/Fivemiletown/Kesh/Lisnaskea (Mixed 4/5 Digit Code Area) | |||
| 1366 | Downham Market | |||
| 1367 | Faringdon | |||
| 1368 | Dunbar | |||
| 1369 | Dunoon | |||
| 1370 | Geographic - unassigned | |||
| 1371 | Great Dunmow | |||
| 1372 | Esher | |||
| 1373 | Frome | |||
| 1374 | Geographic - unassigned | |||
| 1375 | Grays Thurrock | |||
| 1376 | Braintree | |||
| 1377 | Driffield | |||
| 1378 | Geographic - unassigned | |||
| 1379 | Diss | |||
| 1380 | Devizes | |||
| 1381 | Fortrose | |||
| 1382 | Dundee | |||
| 1383 | Dunfermline | |||
| 1384 | Dudley | |||
| 1385 | Geographic - unassigned | |||
| 1386 | Evesham | |||
| 1387 | 0&1 | Dumfries National Dialling | 4 Digit Code Area | |
| 1387 | 2 | Dumfries | 4 Digit Code Area | |
| 1387 | 3 | Langholm | 5 Digit Code Area | |
| 1387 | 4-9 | Dumfries | 4 Digit Code Area | |
| 1388 | 0&1 | Bishop Auckland/Stanhope National Dialling | ELNS | |
| 1388 | 2 | Stanhope | ELNS | |
| 1388 | 3&4 | Bishop Auckland | ELNS | |
| 1388 | 5 | Stanhope | ELNS | |
| 1388 | 6-9 | Bishop Auckland | ELNS | |
| 1389 | Dumbarton | |||
| 1390, 1391 | Geographic - unassigned | |||
| 1392 | Exeter | |||
| 1393 | Geographic - unassigned | |||
| 1394 | Felixstowe | |||
| 1395 | Budleigh Salterton | |||
| 1396 | Geographic - unassigned (former Downpatrick/Newcastle (Mixed 4/5 Digit Code Area) | |||
| 1397 | Fort William | |||
| 1398 | Dulverton | |||
| 1399 | Geographic - unassigned (former Paging Services) |