what county is urbana illinois?
Urbana, Illinois. Not to be confused with Urbana, Ohio. Urbana /ÉËrËbÃ¦nÉ/ is a city in and the county seat of Champaign County, Illinois, United States. The population was 41,250 at the 2010 census. Urbana is the tenth-most populous city in Illinois outside of the Chicago metropolitan area.