| 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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| % of Total | Fair Tax | President | US Senate | Governor | AG | SOS | Comptroller | Treasurer | President | US Senate | Comptroller | US Senate | Governor | AG | SOS | Comptroller | Treasurer | President | US Senate | Governor | AG | SOS | Comptroller | Treasurer | President | US Senate | Governor | AG | SOS | Comptroller | Treasurer | President | US Senate | US Senate | Governor | AG | SOS | Comptroller | Treasurer | President | US Senate | Governor | US Senate | Governor | Governor |
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| Cook County | 37.92% | 38.48% | 38.36% | 38.63% | 38.70% | 38.62% | 38.65% | 38.57% | 38.99% | 38.79% | 38.63% | 36.99% | 37.08% | 36.96% | 36.97% | 36.92% | 36.83% | 38.37% | 37.72% | 37.51% | 37.61% | 37.64% | 37.56% | 37.52% | 38.71% | 38.24% | 37.58% | 37.49% | 37.40% | 37.67% | 37.73% | 38.86% | 39.06% | 38.36% | 38.80% | 38.95% | 38.77% | 38.83% | 38.59% | 39.35% | 40.25% | 39.34% | 40.05% | 39.24% | 40.55% |
| ___Chicago | 18.32% | 18.97% | 18.95% | 19.54% | 19.62% | 19.58% | 19.56% | 19.50% | 19.69% | 19.57% | 19.43% | 18.00% | 18.10% | 18.03% | 18.03% | 17.94% | 17.91% | 19.37% | 18.59% | 18.50% | 18.53% | 18.56% | 18.44% | 18.43% | 19.74% | 19.25% | 18.70% | 18.60% | 18.61% | 18.60% | 18.59% | 19.58% | 19.76% | 19.23% | 19.58% | 19.62% | 19.59% | 19.52% | 19.31% | 20.14% | 20.75% | 19.67% | 19.59% | 19.36% | 20.77% |
| ___Cook Suburbs | 19.60% | 19.50% | 19.41% | 19.08% | 19.07% | 19.04% | 19.09% | 19.07% | 19.26% | 19.23% | 19.20% | 18.99% | 18.97% | 18.94% | 18.93% | 18.98% | 18.92% | 18.99% | 19.12% | 19.02% | 19.08% | 19.08% | 19.12% | 19.10% | 18.97% | 18.99% | 18.84% | 18.89% | 18.79% | 19.08% | 19.14% | 19.13% | 19.18% | 19.10% | 19.19% | 19.31% | 19.15% | 19.29% | 19.26% | 19.08% | 19.36% | 19.24% | 19.31% | 19.85% | 19.38% |
| Collars | 30.31% | 30.10% | 30.22% | 29.36% | 29.39% | 29.30% | 29.38% | 29.39% | 28.79% | 28.95% | 29.05% | 29.02% | 29.19% | 29.20% | 29.12% | 29.19% | 29.26% | 28.55% | 28.39% | 28.42% | 28.43% | 28.37% | 28.41% | 28.42% | 28.28% | 28.52% | 26.99% | 27.17% | 27.06% | 27.04% | 27.16% | 27.02% | 26.92% | 25.91% | 25.64% | 25.73% | 25.60% | 25.53% | 25.77% | 25.68% | 23.67% | 23.87% | 23.81% | 22.72% | 20.85% |
| Downstate | 31.76% | 31.43% | 31.42% | 32.01% | 31.91% | 32.08% | 31.96% | 32.03% | 32.22% | 32.25% | 32.33% | 33.99% | 33.73% | 33.84% | 33.91% | 33.89% | 33.91% | 33.07% | 33.89% | 34.07% | 33.96% | 34.00% | 34.03% | 34.05% | 33.02% | 33.23% | 35.42% | 35.34% | 35.54% | 35.29% | 35.12% | 34.12% | 34.02% | 35.74% | 35.56% | 35.32% | 35.63% | 35.64% | 35.63% | 34.97% | 36.08% | 36.78% | 36.15% | 38.04% | 38.60% |
| TOTAL | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |
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