14 factions
RDR1 Gangs and Factions
The gangs John Marston is sent to break, the rebels and armies he falls in with, and the lawmen holding the paper on him. Named members, the ground each one holds, and what is left of them by 1911.
Rival factions
14Rivals, families and the law. Some are a single ambush; the O'Driscolls run the length of the story.
U.S. Lawmen36 members
United States Army19 members
Dutch's Gang10 members
Reyes' Rebels10 members
Banditos9 members
Bollard Twins gang9 members
Treasure Hunters gang9 members
U.S. Marshals9 members
Walton's gang9 members
Blackwater Police Department5 members
Marston family5 members
Mexican Army5 members
Bureau of Investigation2 members
Williamson gang2 members
Member lists are the members the source gives articles to, which is fewer than the gang has. The count beside each name is the source's own figure where it publishes one.