Aurora is a city in DuPage, Kane, Kendall, and Will counties in the U.S. state of Illinois. The second most populous city in the state, it is the 19th largest city in the Midwest and the 112th largest city in the country. Wikipedia

Columbia is a city of 115,276 people in Missouri, a state of the American Midwest. Founded in 1818 as the county seat of Boone County and home to the University of Missouri, it is the principal municipality of the Columbia Metropolitan Area, the fourth most populous urban area in Missouri. Wikipedia