Atheist groups in Champaign-Urbana:

Secular Student Alliance at Parkland College (SSA-PC)
Parkland College, 
Champaign, IL 61821
http://www.facebook.com/ssaapc

Humanists at UIUC (HUIUC)
University of Illinois
Urbana, IL 61802
http://www.facebook.com/groups/humanistsatuiuc/

Illini Secular Student Alliance (ISSA)
University of Illinois
Urbana, IL 61802
http://www.illinissa.com/

Champaign Urbana Freethinkers (CUFree)
Champaign, IL 61820
http://www.meetup.com/secularhumanism-16/