| Aurora | 179,266 |
| Beecher | 4,690 |
| Bolingbrook | 73,597 |
| Braceville | 726 |
| Braidwood | 6,182 |
| Channahon | 13,706 |
| Coal City | 5,749 |
| Crest Hill | 20,293 |
| Crete | 8,407 |
| Diamond | 2,657 |
| Elwood | 2,216 |
| Frankfort | 20,492 |
| Godley | 591 |
| Homer Glen | 24,516 |
| Joliet | 150,372 |
| Lemont | 17,526 |
| Lockport | 26,118 |
| Manhattan | 10,037 |
| Minooka | 12,816 |
| Mokena | 19,846 |
| Monee | 5,103 |
| Naperville | 149,104 |
| New Lenox | 27,477 |
| Orland Park | 57,850 |
| Park Forest | 21,261 |
| Peotone | 4,182 |
| Rockdale | 1,990 |
| Romeoville | 40,469 |
| Shorewood | 18,254 |
| Steger | 9,438 |
| Symerton | 124 |
| Tinley Park | 54,864 |
| University Park | 7,082 |
| Wilmington | 5,624 |
| Woodridge | 33,826 |
| District 1 | Sherry Newquist |
| District 1 | Judy Ogalla |
| District 2 | Amanda Koch |
| District 2 | Jim Moustis |
| District 3 | Raquel Mitchell |
| District 3 | Margaret Tyson |
| District 4 | Saud Gazanfer |
| District 4 | Jacqueline Traynere |
| District 5 | Gretchen Fritz |
| District 5 | Meta Mueller, Majority Leader |
| District 6 | Don Gould |
| District 6 | Joe VanDuyne |
| District 7 | Steve Balich |
| District 7 | Mike Fricilone, Minority Leader |
| District 8 | Herbert Brooks, Jr. |
| District 8 | Denise Winfrey |
| District 9 | Annette Parker |
| District 9 | Rachel Ventura |
| District 10 | Natalie Coleman |
| District 10 | Tyler Marcum |
| District 11 | Julie Berkowicz |
| District 11 | Mimi Cowan, Speaker of the Will County Board |
| District 12 | Frankie Pretzel |
| District 12 | Tom Weigel |
| District 13 | Mica Freeman |
| District 13 | Debbie Kraulidis |
| New Lenox | Howard Butters, President |
| Jackson | Nancy Bartels, Vice President |
| DuPage | Debra Savage |
| Na-Au-Say | Eric Bernacki |
| Lockport | Richard Davis |
| Homer | Lisa Caparelli-Ruff, Ed.D. |
Like most of the collar counties, Will County was once a Republican stronghold. It went Republican in all but three elections from 1892 to 1988. Since the 1990s, it has become a swing county. It voted for the national winner in every presidential election from 1980 to 2012, but Chicago-born Hillary Clinton won it along with the rest of the "collar counties" aside from McHenry in 2016.
