American Air Mail Society (AAMS) Non-profit organization devoted to the advancement and collecting of first day covers.
American First Day Cover Society (AFDCS) Non-profit organization devoted to the advancement and collecting of first day covers.
American Philatelic Society (APS) Largest non-profit philatelic society in the world, headquartered in Bellefonte, PA.
American Plate Number Single Society (APNSS) Promotes interest in plate number singles and other marginal markings.
American Society of Polar Philatelists Studies stamps, covers, and postal history of the north and south Polar Regions.
American Topical Association (ATA) For the promotion of topical collecting.-->
Canal Zone Study Group (CZSG) Promotes the collecting and study of Canal Zone philately and of materials relating to the Canal Zone.
Captain Cook Society For anyone interested in Captain James Cook, whether professionally or as a hobby.
CartoPhilatelic Society For the study of everything related to maps on stamps – maps, charts, historic maps, tiny and outline maps, globes, etc.
Ceylon Study Circle For the study of everything philatelic related to Ceylon/Sri Lanka.
Ebony Society of Philatelic Events and Reflections (ESPER Promotes the collecting of stamps and philatelic material depicting people and events related to the African diaspora.
Errors, Freaks, and Oddities Collectors Club Studies stamps and postal stationery items that are the result of errors in the production process (misprinted, miscut, or otherwise mishandled).
Institute for Analytic Philately Sponsors technical research activities to improve the stamp collecting hobby.
International Society for Japanese Philately (IJSP) Strives to promote the study of Japanese philately.
International Society of Worldwide Stamp Collectors Strives to promote worldwide stamp collecting for all ages and experience levels.
Liberian Philatelic Society Promotes the collecting of Liberian stamps and postal history.
Lighthouse Stamp Society Promotes the collecting of lighthouses on stamps and related items.
Mexico-Elmhurst Philatelic Society International Promotes the collecting and study of Mexican stamps and of philatelic materials relating to Mexico.
Petroleum Philatelic Society International (PPSI) For collectors of stamps, covers and related items on the subject of oil, natural gas, and the petrochemical industry.
Precancel Society For collectors of precancels.
Sarawak Specialists' Society Promotes the study of stamps and postal history related to Sarawak, Brunei, North Borneo (Sabah)and Labuan.
Scandinavian Collectors Club Seeks to promote fellowship and communication among collectors of Scandinavian philatelic material and encourage research and dissemination of information about such material.
Scouts on Stamps Society International (SOSSI) Promotes the collecting, study, and enjoyment of philatelic items celebrating the Boy Scout and Girl Scout (Guide) movements.
Society for Czechoslovak Philately (SCP) Promotes the collecting, study of, education, and publicizing of all aspects of philately represented by geographic areas of the former Czechoslovakia.
Society for Hungarian Philately Promotes the collecting of stamps and the study of the postal history of Hungary and related areas.
Society of Israel Philatelists Promotes study of Holy Land philately, through various outlets.
Texas Philatelic Association (TPA) Strives to promote the study of Texas philatelic history.
U.S. Philatelic Classics Society Studies US stamps and postal history through December 31, 1900.
United Nations Philatelists Promotes collection, study and exhibition of the issues of the United Nations Postal Administration, including postal history, and related areas, as well as the world-wide topical issues related to the United Nations.
United States Stamp Society (USSSS) Studies postage and revenue stamped paper produced for use in the US and US administered areas.