Stamps
- 341
- Haiti Philatelic Society
- Group studies the stamps, essays, proofs, covers, and related postal material of Haiti.
- 342
- International Society of Guatemala Collectors
- Group promotes interest in the stamps and postal history of modern and colonial Guatemala.
- 343
- Ottoman and Near East Philatelic Society
- Promotes the collection and study of the stamps and postal history of the Ottoman Empire and its successor states.
- 344
- Scandinavia Philatelic Society
- Group studies stamps, postcards, and postal history of Denmark, Iceland, Finland, Norway, and Sweden, plus areas related to those countries such as Greenland and the Faroe Islands.
- 345
- Scandinavian Collectors Club
- Organization is devoted to research about and education regarding the stamps and postal history of Denmark, Greenland, Finland, Iceland, Norway, Sweden, and other related territories.
- 346
- Society for Costa Rica Collectors
- Group is interested in the study of the Latin American nation's postal history.
- 347
- Society of Israel Philatelists
- Group promotes collection of Israel's stamps through a bimonthly publication and educational slide shows.
- 348
- Americana Unit
- Collectors' group specializes in stamps of all nations that honor the United States of America by depicting individuals, landmarks, and other subjects directly related to the country.
- 349
- Astro Space Stamp Society
- Group caters to collectors of space-related stamps, postcards, and covers, and publishes a quarterly magazine.
- 350
- Chemistry and Physics on Stamps Study Unit
- Collectors in group specialize in stamps picturing scientists and science-related topics.
- 351
- Chess on Stamp Study Unit
- Group of collectors specializing in stamps, postmarks, and other chess-related philatelic items provides a quarterly newsletter for members plus checklists for all collectors.
- 352
- Christopher Columbus Philatelic Society
- Group of collectors specializes in stamps and other philatelic material commemorating the voyages of Christopher Columbus.
- 353
- Ebony Society of Philatelic Events and Reflections
- Organization promotes the collection of stamps honoring African Americans and related topics, and encourages stamp collecting by African Americans.
- 354
- Europa Study Unit
- Club promotes the collection of stamps featuring subjects related to the economic, political, and social integration of Europe.
- 355
- Graphics Philately Association
- Club members promote the collection of stamps honoring books and the history of printing.
- 356
- Lions International Stamp Club
- Group promotes the collection of stamps and covers honoring Lions Club International and Lions-related subjects.
- 357
- Mathematical Study Unit
- Club members collect and share information about philatelic materials related to math, mathematicians, and computers.