| UK | Association of British Philatelic Societies | |
| UK | UK Philately | |
| UK | Royal Philatelic Society | |
| USA | American Philatelic Society | |
| West Indies | British Caribbean Philatelic Study Group | |
| West Indies | Jamaica Study Group | |
| Africa | West Africa Study Circle | |
| KG VI | King George VI Collectors Society | |
| Postal History | Postal History Society | |
| Auxiliary Markings Club | The Auxiliary Markings Club (AMC) brings together a diverse group of collectors who are interested in the movement of the mails -- especially mail that had problems. The evidence of those problems are the markings applied to envelopes and packages as the mail was processed. They may have to do with inadequate postage, problems with the delivery address, accidents that occurred with planes, trains, ships or trucks carrying the mail, or literally hundreds of other reasons. | |
| Military | Forces Postal History Society | |
| Transport | British Aerophilatelic Federation | Aerophilately |
| Transport | American Air Mail Society (AAMS) | Aerophilately |
| Transport | TPO & SeaPost | Postal history of handling mail at sea and on the world's railways. |
| Stationery | Postal Stationery Society | |
| Stationery | Aerogramme Society | |
| Revenues | Revenue Society of Great Britain |