Chicago (Cook County) went 83% for Clinton in 2016, 74% for Obama in 2012, 76% for Obama in 2008, 79% for Kerry in 2004 and 68% for Gore in 2000. Biden's 2020 numbers were on the low side of average for a Democrat candidate there, probably didn't involve an unusual number of independents or disaffected Republicans...
St. Louis City went 82.71% for Obama for context. https://en.wikipedia.org/wiki/2012_United_States_presidentia... so higher than cook... but the city of stl is generally even more blue and was one of the highest rates for obama nation wide. STL took it as a point of pride to vote more for obama than chicago where obmama is from.
