From Reboot Illinois:
New data released by the U.S. Census bureau showed that in terms of domestic migration — people moving about within the United States — Illinois saw roughly 105,200 more people leave than arrive.Voters elected a new governor last year, Republican Bruce Rauner, but his reforms are being blocked by Chicago Democrat Michael Madigan, who has been House Speaker for 30 of the last 32 years.
Even when offset by a gain of more than 37,600 by way of international migration, Illinois still ended up about 67,500 in the negative column.
With natural growth (births minus deaths) counted, Illinois showed a net population loss of nearly 22,200 people, or about 0.17 percent of its population.
Of the 50 states, Illinois was the top population loser. Other states showing a net loss of population were Connecticut (-3,876); Maine (-928); Mississippi (-1,110); New Mexico, (-458); Vermont, (-725) and West Virginia (-4,623).