A head to head comparison of the Illinois 2020 General Election gives us an idea of the break down of the voters.      

VP Joseph Biden received 3,266,811 (58%) votes beating President Donald Trump who gained 2,380,628 (42%) by 886,183 votes in Illinois.                                  

President Trump won 77 counties out of the 104 counties that make up Illinois. The record shows that VP Joe Biden won 27 counties.  

2020 IL Primary Election vs Presidential General Elections Counties Won              

Primary Elections

Presidential General Election

Primary Election

In the Primary, President Trump won 83 counties in a 3 way match up. VP Biden trailed behind him winning 20 counties with Senator Sanders winning only 1 county in Illinois Primary.

2020 IL Presidential Primary vs Presidential General Elections w.r.t % Votes and Total Votes Won        

Presidential Primary Elections

Presidential Election

On a head to head count with the total votes between in VP Biden and President Trump between the Presidential Primary and General Elections, percentage (%) vote shift difference is 8% increase for President Trump and a 8% decrease for VP Biden. These percentages are represented by a vote increment of 1,859,672 for Trump and 2,280,150 for Biden at the Presidential General Elections.

Presidential Primary Elections

Presidential General Elections

During the 2020 General elections, a lot of total number of votes were cast. Aside the Electoral Votes, Popular Votes came to the fore as well. Further details regarding overall total votes cast, percentage contributed by the various states, and the winner of Popular votes will be updated soon.

Top 15 Counties in Presidential Primary Elections vs Presidential General Elections

All Candidates (Presidential Primary Elections)

All Candidates (Presidential General Elections)

Primary Elections vs General Elections

These 15 counties play an important role in these primary elections. If a candidate, can get a sizable majority in the larger counties (Cook, Chicago and Cook Suburbs), it becomes very difficult to win majorities in the smaller counties with out voter out reach and increased voter participation in them.

Top 15 Counties Comparison in Primary Elections vs General Elections

Presidential Primary Elections
VP Joseph Biden

Presidential Primary Elections
President Donald Trump

Presidential General Elections
VP Joseph Biden

Presidential General Elections
President Donald Trump

Cook, Chicago and Cook Suburbs, three of the larger counties voted in favor of VP Joseph Biden giving him a 2.1 Million vote advantage out of those counties. Even though President Trump won many other smaller counties, this huge lead was enough to give Biden the upper hand in the State of Illinois.

Related References: 2020 Illinois Primary Election Story, 2016 Illinois Primary Election Story, 2012 Illinois Primary Election Story