Urbana is a city in Champaign County, Illinois, United States, and its county seat. As of the 2020 census, Urbana had a population of 38,336. It is a principal city of the Champaign–Urbana metropolitan area, which had about 236,000 residents in 2020. Urbana is notable for sharing the main campus of the University of Illinois with its twin city of Champaign.