Group
- Cardboard of the Rings1
- Cards Against Humanity1
- Cartoon Hangover9
- Castles & Chemo, Inc.3
- Catalyst Demo Team363
- Catalyst Game Labs2
- Cavegirl Productions1
- Cephalofair Games7
- Chainmail Legion17
- Chaos Haunted & Historical Tours9
- Chaosium1
- Cheese Weasel Logistics1
- Chicago Dungeon Crawl130
- Chimera Productions1
- Christian Gamers Guild2
- Cincinnati Arsenal Gaming28
- Circle City Con1
- Circle City Gaming197
- Closet Gamers, Inc.2
- CoGG33