Group
- Circle City Con1
- ClaireKnits7
- CoGG61
- Columbia Games21
- Comedy Rock Geek Enterprises2
- Con Brio Games6
- ConTessa101
- Corvus Belli5
- Cosmic Wombat Games22
- Cosplay18
- Cosplay Deviants5
- Cosplay Program2
- Craft Hackers8
- Crafty Chica5
- Crafty Gamers38
- Cranky Old Wizards1
- Creative Arts Teaching Seminars13
- Creative Energy Arts4
- Crit Games LLC8
- Crypt Monkey Studios, LLC5