| 2020 | 2020 | 2020 | 2018 | 2018 | 2018 | 2018 | 2018 | 2016 | 2016 | 2016 | 2014 | 2014 | 2014 | 2014 | 2014 | 2014 | 2012 | 2010 | 2010 | 2010 | 2010 | 2010 | 2010 | 2008 | 2008 | 2006 | 2006 | 2006 | 2006 | 2006 | 2004 | 2004 | 2002 | 2002 | 2002 | 2002 | 2002 | 2002 | 2000 | 1998 | 1998 | 1996 | 1994 | 1990 |
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| Trad Collars | Fair Tax Yes | Biden | Durbin | Pritzker | Raoul | White | Mendoza | Frerichs | Clinton | Duckworth | Mendoza | Durbin | Quinn | Madigan | White | Simon | Frerichs | Obama | Giannoulias | Quinn | Madigan | White | Miller | Kelly | Obama | Durbin | Blagojevich | Madigan | White | Hynes | Giannoulias | Kerry | Obama | Durbin | Blagojevich | Madigan | White | Hynes | Dart | Gore | Mosely-Braun | Poshard | Durbin | Netsch | Hartigan |
|---|
| Cook County | 62.89% | 74.35% | 68.77% | 71.86% | 72.09% | 82.08% | 76.83% | 74.18% | 74.68% | 70.40% | 64.54% | 70.94% | 64.74% | 76.17% | 79.88% | 60.90% | 64.93% | 74.01% | 64.32% | 64.38% | 78.33% | 81.60% | 55.07% | 61.91% | 76.21% | 79.93% | 65.18% | 84.57% | 76.84% | 78.87% | 68.12% | 70.25% | 81.14% | 71.27% | 65.93% | 63.30% | 77.33% | 77.00% | 55.60% | 68.63% | 63.59% | 53.98% | 68.17% | 46.66% | 53.56% |
| ___Chicago | 71.39% | 82.53% | 75.00% | 81.34% | 80.89% | 88.13% | 84.86% | 82.75% | 83.73% | 79.03% | 74.15% | 81.50% | 77.35% | 84.80% | 86.87% | 71.54% | 76.83% | 84.00% | 76.72% | 75.43% | 85.72% | 87.83% | 67.78% | 74.78% | 85.41% | 87.20% | 77.38% | 90.04% | 85.34% | 87.20% | 79.45% | 81.28% | 87.99% | 82.46% | 79.07% | 76.09% | 86.69% | 86.54% | 70.01% | 80.14% | 78.00% | 67.60% | 82.26% | 62.30% | 65.49% |
| ___Cook Suburbs | 54.95% | 66.39% | 62.69% | 62.16% | 63.03% | 75.86% | 68.60% | 65.41% | 65.57% | 61.62% | 54.82% | 60.93% | 52.75% | 67.95% | 73.27% | 50.85% | 53.67% | 63.82% | 52.28% | 53.63% | 71.14% | 75.54% | 42.80% | 49.48% | 66.64% | 72.56% | 53.23% | 79.18% | 68.43% | 70.75% | 57.11% | 58.97% | 74.01% | 60.00% | 52.50% | 50.28% | 67.75% | 67.34% | 41.14% | 56.44% | 48.09% | 40.81% | 57.66% | 31.40% | 40.69% |
| Collars | 42.36% | 56.24% | 53.14% | 48.63% | 50.57% | 65.23% | 54.76% | 51.36% | 52.45% | 48.98% | 42.69% | 45.84% | 37.91% | 53.37% | 60.35% | 38.95% | 38.48% | 50.53% | 38.04% | 39.39% | 58.82% | 65.57% | 32.08% | 35.60% | 55.79% | 60.46% | 41.99% | 67.82% | 57.54% | 53.69% | 45.60% | 45.46% | 65.36% | 48.61% | 38.75% | 35.54% | 57.93% | 50.42% | 29.70% | 43.92% | 36.47% | 31.50% | 44.50% | 22.47% | 36.22% |
| Downstate | 32.88% | 40.35% | 41.35% | 40.12% | 38.95% | 55.63% | 45.35% | 44.39% | 37.89% | 42.31% | 38.07% | 41.73% | 33.93% | 47.25% | 55.46% | 35.33% | 38.04% | 45.33% | 34.00% | 34.21% | 55.05% | 61.02% | 32.52% | 35.04% | 51.00% | 60.28% | 39.68% | 63.63% | 52.63% | 56.42% | 45.21% | 44.75% | 61.26% | 56.27% | 46.11% | 45.87% | 64.11% | 56.62% | 38.84% | 46.39% | 36.62% | 49.09% | 49.81% | 28.41% | 47.84% |
| TOTAL | 46.73% | 57.54% | 54.93% | 54.53% | 54.71% | 68.26% | 59.90% | 57.64% | 55.83% | 54.86% | 49.45% | 53.55% | 46.35% | 59.46% | 65.70% | 45.67% | 48.05% | 57.60% | 46.42% | 46.63% | 64.72% | 69.87% | 40.88% | 45.26% | 61.92% | 67.84% | 49.80% | 72.45% | 62.82% | 64.25% | 53.94% | 54.82% | 69.97% | 60.33% | 52.19% | 50.39% | 67.89% | 63.18% | 43.30% | 54.60% | 47.44% | 47.46% | 56.09% | 34.44% | 48.17% |
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