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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Alberta HBC Posts (16 members)
- Alberta NWC Posts (11 members)
- Alberta Not Visited (14 members)
- Alberta Radar Sites (4 members)
- Albuquerque ARTCC (11 members)
- Albuquerque FAA Radar Site (1 member)
- Alcatraz Island (1 member)
- Aleutians West Census Area 155 Batteries (3 members)
- Alexander Blockhouse (1 member)
- Alexandria FAA Radar Site (1 member)
- All (6,970 members)
- All USA Research (2 members)
- Allegheny Arsenal (1 member)
- Allentown Camp (1 member)
- Almaden Air Force Station (1 member)
- Amarillo Air Force Base Radar Site (1 member)
- Amarillo FAA Radar Site (1 member)
- American Camp (2 members)
- American Fur Company Forts (39 members)
- American History Research (1 member)
- American Whiskey Trader Forts (2 members)
- Amherstburg Navy Yard (1 member)
- Anchorage ARTCC (1 member)
- Anchorage NIKE Sites (0 members)
- Andersonville (1 member)
- Andrew Chambers Blockhouse (1 member)
- Andrew Henry's Post (1 member)
- Andrews FAA Radar Site (1 member)
- Angel Island (1 member)
- Angel Peak FAA Radar Site (1 member)
- Anglo-Cherokee War (1 member)
- Anglo-Cherokee War Forts (8 members)
- Antelope Station Post (1 member)
- Antigo Air Force Station (1 member)
- Apalachicola Arsenal (1 member)
- Apalachicola Fort (1 member)
- Apeony Chickasaw Fort (1 member)
- Apple Valley FAA Radar Site (1 member)
- Arbuckle's Fort (1 member)
- Arctic Training Center (1 member)
- Area 51 (1 member)
- Arizona Air Force Bases (2 members)
- Arizona Airfields (17 members)
- Arizona All (197 members)
- Arizona Apache County (1 member)
- Arizona Camps (91 members)
- Arizona Cochise County (24 members)
- Arizona Coconino County (9 members)
- Arizona Counties (15 members)
- Arizona Fort (2 members)