Illinois House District 66
State House District 66
Covers parts of Kane County and McHenry County.
Who Holds This Seat
Running in 2026
Democrat · State Representative
- Ballot
- On the 2026 ballot
- Last Change
- Profile updated · Oct 4
- Raised
- Not on file
- Cash on Hand
- Not on file
No finance filing on record.
Republican
- Ballot
- On the 2026 ballot
- Last Change
- Profile updated · Oct 4
- Raised
- Not on file
- Cash on Hand
- Not on file
No finance filing on record.
The District
Includes Elgin (part), Crystal Lake (part), Carpentersville (part), Algonquin (part), West Dundee, Lake in the Hills (part), Sleepy Hollow and East Dundee (part).
76 precincts · District lines: State house lines: U.S. Census Bureau (1:500,000 cartographic boundary) · Precinct lines: Chicago Board of Election Commissioners, Boundaries - Ward Precincts (2023-2024) (data.cityofchicago.org 6piy-vbxa) for the City of Chicago; Cook County Clerk, Suburban Cook Election Precincts - Current (datacatalog.cookcountyil.gov k7sw-w3b8); DuPage County, Election_Precincts layer (gis.dupageco.org, current, retrieved 2026-09-24); U.S. Census Bureau 2020 VTDs elsewhere in Illinois; U.S. Census Bureau 2020 TIGER/Line VTDs where no official layer; McHenry County GIS, Voting_Precincts FeatureServer/0; 2022 and 2024 generals
Results in This District
| Contest | First | Second | Margin | Votes | Source |
|---|---|---|---|---|---|
| 2024 President64 precinctsIllinois State Board of ElectionsOfficial vote | Kamala D. Harris (D)23,353 · 52.1% | Donald J. Trump (R)20,576 · 45.9% | D+6.2 | 44,823 | Illinois State Board of ElectionsOfficial vote |
| 2022 U.S. Senate58 precinctsIllinois State Board of ElectionsOfficial vote | Tammy Duckworth (D)16,393 · 53.6% | Kathy Salvi (R)13,543 · 44.3% | D+9.3 | 30,568 | Illinois State Board of ElectionsOfficial vote |
| 2022 Governor58 precinctsIllinois State Board of ElectionsOfficial vote | Jb Pritzker (D)16,252 · 53.2% | Darren Bailey (R)13,255 · 43.4% | D+9.8 | 30,524 | Illinois State Board of ElectionsOfficial vote |
| 2020 President87 precinctsIllinois State Board of ElectionsOfficial vote | Joseph R. Biden (D)35,921 · 53.8% | Donald J. Trump (R)29,280 · 43.9% | D+10.0 | 66,722 | Illinois State Board of ElectionsOfficial vote |
| 2020 U.S. Senate87 precinctsIllinois State Board of ElectionsOfficial vote | Richard J. Durbin (D)33,784 · 51.1% | Mark C. Curran Jr. (R)28,927 · 43.8% | D+7.3 | 66,112 | Illinois State Board of ElectionsOfficial vote |
Totals add up the certified precinct results for the precincts inside today's district lines. A precinct split by the district line counts in full, or only in the district holding most of its voters where the linkage assigns it to one, and votes a county reported only countywide (some counties' absentee and early votes) are left out, so totals can differ from an official canvass.
Past Results
State Representative, District 66
2024 General Election · Nov 5, 2024| Candidate | Party | Votes | Share |
|---|---|---|---|
| Suzanne NessDemocrat | Democrat | 27,757 | 53.3% |
| Laurie ParmanRepublican | Republican | 24,292 | 46.7% |
Official vote — Illinois State Board of Elections (certified canvass, precinct vote totals by election authority) · Illinois State Board of Elections — Election Vote Totals by Precinct
State Representative, District 66
2022 General Election · Nov 8, 2022| Candidate | Party | Votes | Share |
|---|---|---|---|
| Suzanne M. NessDemocrat | Democrat | 19,645 | 53.2% |
| Connie CainRepublican | Republican | 17,302 | 46.8% |
Official vote — Illinois State Board of Elections (certified canvass, precinct vote totals by election authority) · Illinois State Board of Elections — Election Vote Totals by Precinct
State Representative, District 66
2020 General Election · Nov 3, 2020| Candidate | Party | Votes | Share |
|---|---|---|---|
| Suzanne M NessDemocrat | Democrat | 29,966 | 52.0% |
| Allen SkillicornRepublican | Republican | 27,698 | 48.0% |
Official vote — Illinois State Board of Elections (certified canvass, precinct vote totals by election authority) · Illinois State Board of Elections — Election Vote Totals by Precinct