Well, Illinois is close. In 2014, slightly more Illinois residents enrolled as full-time freshmen in-state (37,736) than out-of-state (30,143). In the other states I mentioned, literally more state residents enrolled out-of-state than in-state. But I’ll give Illinois an honorable mention as a major exporter of college freshmen.
Consistent with the general pattern, most of the Illinoisans didn’t go far: 3,873 to Iowa, 3,821 to Wisconsin, 3,810 to Missouri, 3,514 to Indiana, 1,961 to Michigan, and 1,936 to Ohio. Most popular OOS destinations included Mizzou (1.437 Illinois freshmen in 2014), University of Iowa (1,378 ), Indiana-Bloomington (1,016), Iowa State (853), Marquette (758), Wisconsin-Madison (599), Saint Louis University (555), Purdue (497), Miami (Ohio) 399, Michigan (362), Kentucky (344), Minnesota-Twin Cities (339), and Michigan State (335).