Source: US. Bureau of the Census
Data for "Resident Population" from 1901 to present are July 1 estimates of each year. Intercensal years between 1990 and 2000 have not yet been revised to reflect Census 2000 results.
This series is calculated by FRB-St. Louis using data series from the Census Bureau.
FRB-St. Louis District States include Arkansas, Illinois, Indiana, Kentucky, Mississippi, Missouri and Tennessee.
US. Bureau of the Census, Resident Population in FRB-St. Louis District States [DSPOP], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/DSPOP, July 23, 2016.