| PO Number | Town / Place name | Code |
|---|---|---|
| 300 | Ferry Bridge | |
| 301 | Feversham | |
| Faversham | ||
| 302 | Folkingham | |
| 303 | Folkestone | |
| 304 | Fordingbridge | |
| 305 | Fowey | |
| 306 | Frome | |
| 307 | Gainsborough | |
| 308 | Garstang | |
| 309 | Gateshead | |
| 310 | Gerrard's Cross | |
| Malpas | ||
| 311 | Glastonbury | |
| 312 | Gloucester | |
| 313 | Lea | |
| Cromford | ||
| 314 | Painswick | |
| 315 | Thornbury | |
| 316 | Godalming | |
| 317 | Godstone | |
| Chelford | ||
| 318 | Bletchingley | |
| Llanfyrnach | ||
| 319 | Goole | |
| 320 | Gosport | |
| 321 | Grantham | |
| 322 | Gravesend | |
| 323 | Grimsby | |
| 324 | Guernsey | |
| 325 | Guildford | |
| 326 | Guisborough | |
| 327 | Gretabridge | |
| Shrewton | ||
| 328 | Hadleigh | |
| Edgware | ||
| 329 | Halesworth | |
| 330 | Halifax | |
| 331 | Sowerby Bridge | |
| Nantymoel | ||
| 332 | Todmorden | |
| 333 | Northowram | |
| Blackmill | ||
| 334 | Halstead | |
| 335 | Haverhill | |
| Leckhampton | ||
| 336 | Harleston | |
| 337 | Harlow | |
| 338 | Harrowgate | |
| Harrogate | ||
| 339 | Hartfordbridge | |
| Aberporth | ||
| 340 | Harwich | |
| 341 | Haslemere | |
| Westbury on Severn | ||
| 342 | Hastings | |
| Hastings Station Office | ||
| High St Hastings | ||
| White Rock Hastings | ||
| St. Leonards-on-Sea Station Office | ||
| Kings Rd. St. Leonards-on-Sea | ||
| St. Leonards-on-Sea Kings Rd. B.O. | ||
| St. Leonards-on-Sea Marina | ||
| 343 | Hatfield | |
| 344 | Havant | |
| 345 | Haverfordwest | |
| 346 | Hawes | |
| 347 | Hay | |
| 348 | Bruntless | |
| Coity | ||
| 349 | Glasbury | |
| 350 | Haydonbridge | |
| 351 | Helston | |
| 352 | Hayle | |
| 353 | Hemel Hempstead | |
| 354 | Kings Langley | |
| 355 | Henley-on-Thames | |
| 356 | Nettlebed | |
| Charing | ||
| 357 | Hereford | |
| 358 | Eardisley | |
| Radstock | ||
| 359 | Hertford | |
| 360 | Hexham | |
| 361 | Heytesbury | |
| Loughor | ||
| 362 | Deptford Inn | |
| Brizenorton | ||
| 363 | Higham Ferres | |
| 364 | High Wycombe | |
| 365 | Hinckley | |
| 366 | Hindon | |
| 367 | Hitchin | |
| 368 | Hobbs Point | |
| Pembroke Dock | ||
| 369 | Hoddesdon | |
| 370 | Holbeach | |
| 371 | Holt | |
| 372 | Blakeney | |
| 373 | Cley | |
| 374 | Holyhead | |
| 375 | Holywell | |
| 376 | Honiton | |
| 377 | Ottery St. Mary | |
| 378 | Horncastle | |
| 379 | Old Bolingbroke | |
| Charlton | ||
| Church Lane Charlton, Kent | ||
| Lower Rd. Charlton, Kent | ||
| Old Charlton | ||
| 380 | Horndean | |
| 381 | Horsham | |
| 382 | Howden | |
| 383 | Hull | |
| Hull Sorting Tender | ||
| Hull - S.T. | ||
| 384 | Filey | |
| 385 | Hedon | |
| Shooters Hill | ||
| 386 | Barrow-on-Humber | |
| Welling | ||
| 387 | Huddersfield | |
| 388 | Marsden | |
| Bexley Heath | ||
| 389 | Slaithwaite | |
| Bexley | ||
| 390 | Hungerford | |
| 391 | Aldbourne | |
| 392 | Lambourne | |
| Lambourn | ||
| 393 | Ramsbury | |
| 394 | Hounslow | |
| 395 | Southall | |
| 396 | Huntingdon | |
| 397 | Buckden | |
| Crayford | ||
| 398 | Hythe, Kent | |
| 399 | Ilchester |