Suburban Cook County
Registration and Voter Turnout 1990 - 2024
Primary Elections
| Year | Registered Voters | Ballots Cast | Percent Turnout |
| 1990 | 1,248,996 | 377,715 | 30.2% |
| 1992* | 1,185,460 | 476,517 | 40.2% |
| 1994 | 1,270,171 | 355,620 | 28.0% |
| 1996* | 1,216,588 | 309,772 | 25.5% |
| 1998 | 1,348,524 | 322,970 | 23.9% |
| 2000* | 1,219,409 | 282,041 | 23.1% |
| 2002 | 1,313,943 | 438,844 | 33.4% |
| 2004* | 1,295,632 | 406,115 | 31.3% |
| 2006 | 1,383,846 | 345,970 | 25.0% |
| 2008* | 1,350,580 | 585,449 | 43.3% |
| 2010 | 1,439,415 | 367,688 | 25.5% |
| 2012* | 1,394,649 | 329,537 | 23.6% |
| 2014 | 1,451,593 | 232,088 | 16.0% |
| 2016* | 1,443,261 | 701,525 | 48.6% |
| 2018 | 1,549,688 | 450,143 | 29.1% |
| 2020* | 1,570,127 | 461,966 | 29.4% |
| 2022 | 1,630,741 | 319,662 | 19.6% |
| 2024* | 1,600,364 | 287,229 | 17.9% |
* Presidential years
General Elections
| Year | Registered Voters | Ballots Cast | Percent Turnout |
| 1990 | 1,245,107 | 657,674 | 52.8% |
| 1992* | 1,399,886 | 1,062,229 | 75.9% |
| 1994 | 1,272,630 | 632,598 | 49.7% |
| 1996* | 1,328,808 | 872,447 | 65.7% |
| 1998 | 1,262,137 | 680,917 | 53.9% |
| 2000* | 1,308,940 | 954,769 | 72.9% |
| 2002 | 1,365,947 | 697,872 | 51.1% |
| 2004* | 1,378,159 | 1,024,867 | 74.3% |
| 2006 | 1,349,371 | 680,696 | 49.7% |
| 2008* | 1,436,210 | 1,056,242 | 73.5% |
| 2010 | 1,370,186 | 719,090 | 52.5% |
| 2012* | 1,416,811 | 1,001,693 | 70.7% |
| 2014 | 1,398,724 | 696,403 | 49.8% |
| 2016* | 1,512,190 | 1,089,840 | 72.1% |
| 2018 | 1,587,447 | 883,457 | 55.7% |
| 2020* | 1,669,040 | 1,188,017 | 71.1% |
| 2022 | 1,648,706 | 743,892 | 45.1% |
* Presidential years
Turnout - Primary v. General
| Year | Primary | General | Difference |
| 1990 | 30.2% | 52.8% | 22.6% |
| 1992* | 40.2% | 75.9% | 35.7% |
| 1994 | 28.0% | 49.7% | 21.7% |
| 1996* | 25.5% | 65.7% | 40.2% |
| 1998 | 23.9% | 53.9% | 30.0% |
| 2000* | 23.1% | 72.9% | 49.8% |
| 2002 | 33.4% | 51.1% | 17.7% |
| 2004* | 31.3% | 74.3% | 43.0% |
| 2006 | 25.0% | 49.7% | 24.7% |
| 2008* | 43.3% | 73.5% | 30.2% |
| 2010 | 25.5% | 52.5% | 27.0% |
| 2012* | 23.6% | 70.7% | 47.1% |
| 2014 | 16.0% | 49.8% | 33.8% |
| 2016* | 46.8% | 72.1% | 25.3% |
| 2018 | 29.1% | 55.7% | 26.6% |
| 2020* | 29.4% | 71.1% | 41.7% |
| 2022 | 19.6% | 45.1% | 25.5% |
* Presidential years
Turnout in Consolidated Elections 1999-2021
| Year | Registered Voters | Ballots Cast | Percent Turnout |
| 1999 | 1,334,905 | 263,452 | 19.7% |
| 2001 | 1,302,197 | 377,595 | 29.0% |
| 2003 | 1,321,089 | 300,484 | 22.7% |
| 2005 | 1,418,280 | 382,587 | 27.0% |
| 2007 | 1,371,803 | 236,050 | 17.2% |
| 2009 | 1,463,070 | 304,766 | 20.8% |
| 2011 | 1,395,756 | 233,350 | 16.7% |
| 2013 | 1,455,446 | 275,637 | 18.9% |
| 2015 | 1,416,706 | 201,180 | 14.2% |
| 2017 | 1,534,858 | 272,610 | 17.7% |
| 2019 | 1,603,193 | 225,973 | 14.1% |
| 2021 | 1,668,641 | 261,766 | 15.9% |
| 2023 | 1,657,359 | 228,962 | 13.8% |