Check out TruHarmony Yoga in Chicago here: 
http://www.truharmonyyoga.com/

Check out Lakeshore Sport and Fitness, Lincoln Park in Chicago here:
http://lsac.com/new/

Check out Power Yoga Chicago in Lincoln Park, Chicago here:
http://www.poweryogachicago.com/Power_Yoga_Chicago/Home.html

Checkout Lululemon on Michigan Avenue in Chicago here:
http://www.lululemon.com/chicago/michiganavenue

Check out Eldorado Shambhava School of Yoga here:  http://www.eldoradoyoga.net/

Check out Shoshoni Yoga Retreat and Ashram here: http://www.shoshoni.org/

Check out Baron Baptiste Power Vinyasa here: http://www.baronbaptiste.com/

Check out the National Yoga Alliance here:     
http://www.yogaalliance.org/