| PO Number | Town / Place name | Code |
|---|---|---|
| 200 | Christchurch | |
| 201 | Chislehurst | |
| 202 | Chudleigh | |
| 203 | Chumleigh | |
| Bwlch | ||
| 204 | Cirencester | |
| 205 | Dunkirk | |
| Worcester Park | ||
| 206 | Clare | |
| Bream | ||
| 207 | Clitheroe | |
| 208 | Cobham | |
| 209 | Cockermouth | |
| 210 | Colchester | |
| 211 | Boxford | |
| Derri | ||
| 212 | Coleford | |
| 213 | Coleshill | |
| Woodville | ||
| 214 | Cullompton | |
| 215 | Colsterworth | |
| Repton | ||
| 216 | Congleton | |
| 217 | Monksheath | |
| Barton-u-Needwood | ||
| Preston-u-Needwood | ||
| 218 | Conway | |
| 219 | Corwen | |
| 220 | Bala | |
| 221 | Barmouth | |
| 222 | Dolgelly | |
| 223 | Coventry | |
| 224 | Cowbridge | |
| 225 | Cowes | |
| 226 | Cranbrook | |
| Tutbury | ||
| 227 | Biddenden | |
| Swadincote | ||
| 228 | Crawley | |
| 229 | Crediton | |
| 230 | Crewkerne | |
| 231 | Crickhowell | |
| 232 | Cuckfield | |
| 233 | Darlington | |
| 234 | Smeaton | |
| Llansamlet | ||
| 235 | Staindrop | |
| 236 | Dartford | |
| 237 | Dartmouth | |
| 238 | Daventry | |
| 239 | Dawlish | |
| 240 | Deal | |
| 241 | Denbigh | |
| 242 | Derby | |
| 243 | Melbourne, Derby | |
| 244 | Ticknall | |
| Tally | ||
| 245 | Dereham | |
| 246 | Briningham | |
| Mountain Ash | ||
| 247 | Elmham | |
| 248 | Guist | |
| Felstead | ||
| 249 | Devizes | |
| 250 | Devonport | |
| 251 | St. Germains | |
| 252 | Torpoint | |
| Seascale | ||
| 253 | Dewsbury | |
| 254 | Diss | |
| 255 | Doncaster | |
| 256 | Dorchester | |
| 257 | Dorking | |
| 258 | Dover | |
| Dover Station Office | ||
| 259 | Walmer | |
| New Walshingham | ||
| Walsingham, Norfolk | ||
| 260 | Downham | |
| 261 | Driffield | |
| 262 | Droitwich | |
| 263 | Dudley | |
| 264 | Dunchurch | |
| Woolwich | ||
| 265 | Dunmow | |
| 266 | Dunstable | |
| 267 | Durham | |
| 268 | Seaham | |
| Broseley | ||
| 269 | Dursley | |
| 270 | Berkeley | |
| 271 | Eastbourne | |
| 272 | East Grinstead | |
| 273 | Eccleshall | |
| 274 | Ellesmere | |
| 275 | Ely | |
| 276 | Much Wenlock | |
| 277 | Emsworth | |
| 278 | Enstone | |
| 279 | Epping | |
| 280 | Epsom | |
| 281 | Ermebridge | |
| Madeley | ||
| 282 | Modbury | |
| Dawley | ||
| 283 | Esher | |
| 284 | Evesham | |
| 285 | Exeter | |
| 286 | Exmouth | |
| 287 | Eye | |
| 288 | Fakenham | |
| 289 | Walsingham | |
| Coalbrookdale | ||
| 290 | Falmouth | |
| 291 | Fareham | |
| 292 | Farnham | |
| 293 | Faringdon | |
| 294 | Fairford | |
| 295 | Highworth | |
| 296 | Letchlade | |
| 297 | Fazeley | |
| 298 | Felton | |
| 299 | Fenny Stratford | |
| Horsehay |