American Air Mail Society
American Association of Philatelic Exhibitors
American First Day Cover Society
American Revenue Association
American Topical Association
APS Membership Committee
Boston 2026 World Expo
Canadian Association of Philatelic Exhibitions
Carriers and Locals Society
Carto Philatelic Society
Cats on Stamps Study Unit
China Stamp Society
Collectors Club of Chicago
Collectors Club of NY
Connecticut Cover Club
Falkland Islands Philatelic Study Group
Gastronomy on Stamps Study Unit
Gay and Lesbian History on Stamps
Germany Philatelic Society
Metropolitan Airpost Society
New Haven Philatelic Society
Penguins On Stamps Study Unit
Plate Number Coil Collectors Club (PNC3)

Rocky Mountain Philatelic Library
Scandinavian Collectors Club
Scouts on Stamps Society International (SOSSI)

Society for Hungarian Philately
Spellman Museum of Stamps and History
Springfield Stamp Club
The Christmas Seal & Charity Stamp Society
The Philatelic Foundation
U.S. Philatelic Classics Society, Inc.
United Nations Philatelists Inc.
United Postal Stationery Society
United States Stamp Society
William C. Stone Chapter (Springfield Stamp Club)
Wine on Stamps Study Unit
Women Exhibitors
Wreck & Crash Mail Society
Royal Philatelic Society London