- Cleveland Area Mensa - The North Coast of Ohio, with members as far east as Ashtabula, as far west as Sandusky.
cleveland.us.mensa.org
- Columbus Area Mensa - Central Ohio.
www.iwaynet.net/~ggwiz/Col-M
- Dayton Area Mensa - Dayton, Ohio.
www.dnaco.net/~poltr1/DAM
- East Central Ohio Mensa - Medina, Portage, Stark, Summit, Richland, Mahoning, Columbiana, Trumbull, Wayne, Holmes, Tuscarawas, Crawford, and Ashland counties.
www2.acorn.net/~ag291
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