Challenge Results
...city MO 10/30/2009 110,440 121,212 Kansas City city MO 11/02/2009 451,572 480...city MD 12/3/2008 637,455 640,150 Kansas City city MO 1/29/2009 450,375 475
https://www.census.gov/programs-surveys/popest/about/challenge-program/results.html