Pritzker appeared to outpace Rauner by a margin of 28.2 percent on Tuesday in the county.
In comparison, the 2014 winner, Democrat Pat Quinn, won by a margin of 31.5 percent in that jurisdiction, beating Republican Bruce Rauner, who received 447,388 votes to Quinn's 870,866.
2018 Governor race results vs. 2014
Precinct/ County/ Township
GOP 2018
Votes/%
Dem. 2018
Votes/%
GOP 2014
Votes/%
Dem. 2014
Votes/%
Cook County
Bruce Rauner
283,629/ 33.75%
JB Pritzker
520,852/ 61.97%
Bruce Rauner
447,388/ 33.3%
Pat Quinn
870,866/ 64.7%