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-Kansas City District includes all of Colorado, Kansas, Nebraska, Oklahoma, Wyoming, and parts of New Mexico and Missouri.
Source: US. Bureau of the Census
US. Bureau of the Census, Resident Population in FRB-Kansas City District [D10POP], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/D10POP/, July 30, 2015.