2016 census estimates were released a couple days ago, as of July 1, 2016:
Kansas City, MO-KS Metro Area = 2,104,509 (+20,045 since 7/1/2015, +95,167 since 2010 census)
Kansas City-Overland Park-Kansas City, MO-KS CSA = 2,446,396 (+21,467 since 7/1/2015, +103,388 since 2010 census)
Jackson County = 691,801 (+5,428 since 7/1/2015, +17,643 since 2010 census)
Johnson County = 584,451 (+5,693 since 7/1/2015, +40,272 since 2010 census)
Clay County = 239,085 (+3,614 since 7/1/2015, +17,146 since 2010 census)
Wyandotte County = 163,831 (+736 since 7/1/2015, +6,326 since 2010 census)
Cass County = 102,845 (+1,349 since 7/1/2015, +3,367 since 2010 census)
Platte County = 98,309 (+2,092 since 7/1/2015, +8,987 since 2010 census)
MO side = 1,233,501 (+12,385 since 7/1/2015, +44,513 since 2010 census)
KS side = 871,008 (+7,660 since 7/1/2015, +50,654 since 2010 census)
and on the other side of MO:
St. Louis, MO-IL Metro Area = 2,807,002 (-1,328 since 7/1/2015, +19,301 since 2010 census)
St. Louis-St. Charles-Farmington, MO-IL CSA = 2,911,769 (-1,385 since 7/1/2015, +19,272 since 2010 census)
St. Louis County = 998,581 (-3,124 since 7/1/2015, -373 since 2010 census)
St. Charles County = 390,918 (+5,747 since 7/1/2015, +30,433 since 2010 census)
St. Louis City = 311,404 (-3,471 since 7/1/2015, -7,890 since 2010 census)
Madison County = 265,759 (-312 since 7/1/2015, -3,523 since 2010 census)
St. Clair County = 262,759 (-1,320 since 7/1/2015, -7,297 since 2010 census)
Jefferson County = 224,226 (+318 since 7/1/2015, +5,493 since 2010 census)
Franklin County = 102,838 (+456 since 7/1/2015, +1,346 since 2010 census)
MO side = 2,117,036 (+775 since 7/1/2015, +32,999 since 2010 census)
IL side = 689,966 (-2,103 since 7/1/2015, -13,698 since 2010 census)
county data can be found here:
https://www.census.gov/data/tables/2016 ... total.html