According to the 2013 U.S. Census Bureau, 15,800 persons lived in Illinois who were residents of Indiana a year earlier. That’s 12 percent of the
135,500 Hoosiers who left the state in that period. Fewer people from other states (133,500) became Indiana residents and 23 percent of them (30,600) came from Illinois.
That is a 2 for 1 trade off on residents.