The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 110 Percent Opinions (32 members)
- 12th Man Opinions (1 member)
- 18-1 Opinions (2 members)
- 1851 Births (1 member)
- 1871 Boston Red Stockings Players (1 member)
- 1871 New York Mutuals Players (1 member)
- 1871 Rockford Forest Citys Players (3 members)
- 1872 Baltimore Canaries Players (1 member)
- 1872 Boston Red Stockings Players (1 member)
- 1872 Brooklyn Eckfords Players (1 member)
- 1872 Cleveland Forest Citys Players (1 member)
- 1872 Middletown Mansfields Players (1 member)
- 1872 New York Mutuals Players (1 member)
- 1872 Philadelphia Athletics Players (1 member)
- 1873 Baltimore Canaries Players (2 members)
- 1873 Boston Red Stockings Players (3 members)
- 1873 Philadelphia Athletics Players (1 member)
- 1873 Philadelphia White Stockings Players (1 member)
- 1874 Boston Red Stockings Players (2 members)
- 1874 Hartford Dark Blues Players (2 members)
- 1874 New York Mutuals Players (1 member)
- 1874 Philadelphia Athletics Players (1 member)
- 1874 Philadelphia White Stockings Players (1 member)
- 1875 Boston Red Stockings Players (2 members)
- 1875 Brooklyn Atlantics Players (2 members)
- 1875 Chicago White Stockings Players (1 member)
- 1875 Hartford Dark Blues Players (1 member)
- 1875 Philadelphia Athletics Players (1 member)
- 1875 Philadelphia Centennials Players (1 member)
- 1875 Philadelphia White Stockings Players (1 member)
- 1875 St. Louis Brown Stockings Players (1 member)
- 1876 Boston Red Caps Players (1 member)
- 1876 Chicago White Stockings Players (3 members)
- 1876 Hartford Dark Blues Players (1 member)
- 1876 Louisville Grays Players (1 member)
- 1877 Boston Red Caps Players (1 member)
- 1877 Chicago White Stockings Players (2 members)
- 1877 Cincinnati Reds Players (3 members)
- 1878 Boston Red Caps Players (1 member)
- 1878 Chicago White Stockings Players (1 member)
- 1878 Cincinnati Reds Players (1 member)
- 1878 Providence Grays Players (1 member)
- 1879 Buffalo Bisons Players (1 member)
- 1879 Chicago White Stockings Players (1 member)
- 1879 Cincinnati Reds Players (2 members)
- 1879 Providence Grays Players (2 members)
- 1879 Troy Trojans Players (1 member)
- 1880 Boston Red Caps Players (1 member)
- 1880 Buffalo Bisons Players (1 member)
- 1880 Chicago White Stockings Players (2 members)