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Central Indiana Mensa
http://indymensa.tripod.com/
Indianapolis, also covering Carmel, Lafayette, Kokomo, Muncie and Bloomington.
Chicago Area Mensa
http://chicago.us.mensa.org/
Including Chicago, IL, and part of northern Indiana
Cincinnati Area Mensa
http://cincinnati.us.mensa.org/
Including parts of Ohio, Illinois and Kentucky
Kentuckiana Mensa
http://kentuckiana.us.mensa.org/
Including Louisville, KY, and part of southern Indiana