Presidential primary elections for three parties were held in Illinois . From January 25 to February 17 , 2016 , the Green Party of the United States held primaries and caucuses , as part of the Green Party presidential primaries , to elect delegates representing a candidate at the 2016 Green National Convention . Physician and activist Jill Stein won a landslide of the popular vote , taking almost all of the state 's 23 delegates . On March 15 , 2016 , both the Democratic and Republican parties held primaries in Illinois as part of a five-state contest being held on the day in both the Democratic and Republican presidential primaries . In the Democratic primaries , 156 pledged delegates to the 2016 Democratic National Convention were elected and awarded to candidates proportionally , according to countywide and statewide vote . In the Republican primaries , 69 delegates to the 2016 Republican National Convention were elected and awarded to the first place candidate , according to statewide vote
2016 Green National Convention
2016 Green National Convention
2016 United States presidential election in Illinois