- Central Illinois Marine Aquarists (CIMA)
- Central Ohio Reef Aquarists (CORA)
- Bloomington Normal Area Reef Club (BNARC)
- Central Wisconsin Reef Club-(CWRC)
- Chicagoland Marine Aquarium Society (CMAS)
- Cincinnati Marine Aquarium Society
- Cincinnati Reefkeepers Society
- Cleveland Saltwater Enthusiast's Association (C-SEA)
- Grand Rapids Marine Aquarium Society (GRMAS)
- Greater Iowa Reef Society
- Greater Minnesota Reef Society
- Indiana - Fort Wayne Marine Aquarists Society (FWMAS)
- Indiana Coral Club
- Indiana Marine Aquarium Society (INDMAS)
- Joliet Area Reef Club
- Lincoln Area Reef Club (LARC)
- M.O.R.C. (Mid-Ohio Reefers Club)
- Madison Area Reef Society (M.A.R.S)
- Mahoning Youngstown Saltwater Enthusiast Association (MY-SEA)
- Marine Aquarium Society of Michigan (MASM)
- Mid-Missouri Saltwater Aquarium Club
- Northern Indiana Marine Aquarium Society (NIMAS)
- Northern Wisconsin Reef Society
- Northwest Ohio Reef Association (NORA)
- Omaha Marine Society
- Red River Valley Aquarium Club
- Rockford Reefers
- Saint Louis Area Saltwater Hobbyists (SLASH)
- Saltwater Enthusiasts Association of Springfield
- Saltwater Enthusiasts Association of St. Louis (SEASL)
- Sioux Falls Area Aquarium Society
- South Dakota-West River Area
- Springfield-Decatur, Illinois Reef Builders (SDIRB)
- Stateline Marine And Reef Tank ...... SMART Ohio/Michigan
- Toledo Reef Aquarium Club (TRAC)
- Upper Peninsula of Michigan Marine Aquarium Society
- West Michigan Marine Aquarium Club (WMMAC)
- Western Ohio Reef Club WORC
- Western Wisconsin's Reef Club
- Wisconsin - Fox Valley Reefers Club (FVRC)
- Wisconsin Reef Society (WRS)