Source: US. Bureau of the Census
All observations are July 1 estimates of each year.
This series is calculated by FRB-St. Louis using data series from the Census Bureau. The FRB-Chicago District includes all of Iowa and most of Illinois, Indiana, Michigan, and Wisconsin.
US. Bureau of the Census, Resident Population in FRB-Chicago District [D7POP], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/D7POP, October 26, 2016.