Champaign, Illinois, United States Champaign is a city in Champaign County, Illinois, United States. Champaign was founded in 1855, when the Illinois Central Railroad laid its rail track two miles (3 km) west of downtown Urbana. Thereâ€™s no excuse to be bored in Champaign. With countless street festivals, museums, sporting events, art galleries, parks, concerts, and more. Champaign is the home to internet pioneers Yahoo!.