The population of the Chicago metropolitan area grew by 869,000 (11.6%) between 1990 and 2000, the largest decade of growth in 30 years. The gain of 112,000 in the City of Chicago was the first in more than 50 years. Overall, gains were greatest in the outer suburbs and smallest in the city. Much of this growth was fueled by immigration and natural increase, with Hispanics contributing disproportionately to both.
Chicago Fed Letter
The Federal Reserve Bank of Chicago
Johnson, Kenneth M., "The changing face of Chicago: Demographic trends in the 1990s" (2002). Chicago Fed Letter. 76.