- Glencoe, IL, United States
- Glen Ellyn, IL, United States
- Moline, IL, United States
- Springfield, IL, United States
- Des Moines, IA, United States
- Cedar Rapids, IA, United States
- St Paul, MN, United States
- Green Bay, WI, United States
- Menasha, WI, United States
- Milwaukee, WI, United States
- Madison, WI, United States
Illinois
- Midwest Bonsai Society – Glencoe
- Prairie State Bonsai Society – Glen Ellyn
- Quad City Bonsai Club – Moline
- Springfield Bonsai Society – Springfield
Iowa
- Iowa Bonsai Association – Des Moines
- Eastern Iowa Bonsai Association – Cedar Rapids
Minnesota
- Minnesota Bonsai Society – St. Paul
Wisconsin
- Badger Bonsai Society – Madison
- Arbor Arts Collective (original Milwaukee chapter) – Milwaukee
Membership by invitation only - Bay Area Bonsai Society – Green Bay
- Fox Valley Bonsai Society – Menasha
- Milwaukee Bonsai Society – Milwaukee
Badger Bonsai Society 