Which Illinois counties moved most toward Democrats in 2026?
By Dem movement (2026 margin minus Harris's 2024 margin, in points):
- Kendall County: +18.4
- Will County: +17.7
- Kane County: +17.5
- Cook County: +17.2
- McHenry County: +16.3
Illinois: 2026 election results by county and religion
How much did Illinois move toward Democrats in 2026?
In Illinois, the Democratic margin in the 2026 U.S. Senate race shifted +12.3 points from Harris's 2024 margin (D+11.0 in 2024, D+23.3 in 2026), counting all votes together. 95 of 102 counties moved toward Democrats, and the median county moved +6.0 points.
Map of Dem movement by county in Illinois
R +30D +30Blue moved toward Democrats, red toward Republicans; the deeper the color, the bigger the move. Hover or tap a county for details.
Which Illinois counties have the largest Christian share, and how did they move?
Share of the 2020 population belonging to a Christian congregation (leaving out counties where members outnumber residents):
- Adams County: 73.4% Christian, Dem movement −0.8
- Clay County: 71.1% Christian, Dem movement +1.9
- Moultrie County: 69.2% Christian, Dem movement +3.3
- Clark County: 69.0% Christian, Dem movement +3.7
- White County: 66.7% Christian, Dem movement +6.6
Illinois counties ranked by Dem movement
Dem movement is the 2026 Democratic margin in the state's top race (U.S. Senate) minus Harris's 2024 margin, in points. Religion columns are each group's share of the 2020 population, counting congregation members, not how people identify.
| County | Dem movement | 2024 margin | 2026 margin | Christian | Protestant | Evangelical | Catholic | No Congregation |
|---|---|---|---|---|---|---|---|---|
| Kendall County | +18.4 | D+1.5 | D+19.9 | 26.8% | 8.4% | 4.7% | 17.6% | 72.8% |
| Will County | +17.7 | D+1.6 | D+19.3 | 40.2% | 14.1% | 10.4% | 24.8% | 56.8% |
| Kane County | +17.5 | D+9.4 | D+26.9 | 49.3% | 14.0% | 8.8% | 33.6% | 43.6% |
| Cook County | +17.2 | D+42.0 | D+59.2 | 46.5% | 15.7% | 7.4% | 28.9% | 45.7% |
| McHenry County | +16.3 | R+5.3 | D+11.0 | 38.1% | 11.2% | 5.5% | 25.8% | 61.7% |
| Rock Island County | +15.9 | D+9.6 | D+25.5 | 30.4% | 18.6% | 8.0% | 10.0% | 68.4% |
| DuPage County | +15.0 | D+13.3 | D+28.4 | 54.1% | 15.7% | 9.6% | 36.2% | 36.4% |
| Alexander County | +14.5 | R+19.2 | R+4.7 | 42.4% | 38.8% | 19.5% | 1.4% | 56.9% |
| Grundy County | +14.4 | R+29.6 | R+15.2 | 36.1% | 15.6% | 8.6% | 18.9% | 63.9% |
| Kankakee County | +14.2 | R+20.8 | R+6.6 | 47.7% | 25.6% | 14.9% | 20.7% | 52.2% |
| Putnam County | +13.8 | R+22.8 | R+9.0 | 40.1% | 16.2% | 2.4% | 23.9% | 59.9% |
| DeKalb County | +13.8 | D+2.0 | D+15.7 | 48.8% | 21.1% | 8.7% | 25.3% | 46.8% |
| Lake County | +13.4 | D+20.8 | D+34.1 | 45.7% | 13.0% | 7.7% | 31.1% | 48.9% |
| Gallatin County | +13.3 | R+53.9 | R+40.5 | 41.9% | 20.7% | 17.6% | 21.2% | 57.7% |
| Madison County | +12.6 | R+13.3 | R+0.7 | 46.1% | 29.6% | 20.0% | 15.3% | 52.2% |
| Winnebago County | +11.9 | D+0.6 | D+12.4 | 55.3% | 29.8% | 21.0% | 23.8% | 43.0% |
| LaSalle County | +11.5 | R+18.5 | R+7.0 | 39.3% | 18.6% | 10.7% | 19.5% | 60.7% |
| Boone County | +11.5 | R+14.5 | R+3.0 | 46.9% | 15.6% | 8.5% | 29.2% | 53.1% |
| Calhoun County | +11.0 | R+55.9 | R+44.9 | 38.7% | 19.1% | 15.5% | 19.6% | 61.3% |
| McLean County | +10.3 | D+4.9 | D+15.2 | 40.1% | 33.3% | 22.4% | 5.6% | 55.7% |
| Jackson County | +10.2 | D+3.5 | D+13.7 | 39.3% | 34.9% | 25.2% | 2.9% | 54.0% |
| Peoria County | +10.2 | D+4.7 | D+14.9 | 39.5% | 25.4% | 15.0% | 13.0% | 56.8% |
| Cass County | +9.9 | R+43.4 | R+33.5 | 57.2% | 37.1% | 18.2% | 17.9% | 41.8% |
| St. Clair County | +9.5 | D+7.9 | D+17.4 | 44.8% | 29.5% | 18.5% | 13.4% | 53.6% |
| Mason County | +8.9 | R+42.2 | R+33.4 | 31.5% | 30.8% | 22.2% | 0.7% | 68.5% |
| Whiteside County | +8.7 | R+14.7 | R+6.0 | 62.8% | 36.3% | 19.6% | 25.7% | 37.2% |
| Williamson County | +8.6 | R+38.8 | R+30.2 | 36.6% | 29.5% | 23.7% | 6.5% | 63.4% |
| Montgomery County | +8.5 | R+44.0 | R+35.5 | 40.2% | 31.8% | 23.2% | 7.7% | 59.8% |
| Champaign County | +8.3 | D+24.1 | D+32.3 | 38.1% | 24.8% | 16.3% | 11.5% | 60.3% |
| Lawrence County | +8.1 | R+56.2 | R+48.2 | 26.3% | 22.9% | 11.9% | 2.6% | 73.7% |
| Macon County | +8.0 | R+18.9 | R+10.9 | 45.1% | 34.2% | 23.9% | 9.4% | 53.7% |
| Macoupin County | +7.8 | R+39.2 | R+31.4 | 41.5% | 30.4% | 19.8% | 11.1% | 58.4% |
| Hardin County | +7.8 | R+61.8 | R+54.0 | 38.4% | 31.6% | 30.8% | 6.9% | 61.5% |
| Piatt County | +7.7 | R+30.5 | R+22.8 | 36.6% | 29.6% | 13.7% | 6.9% | 63.4% |
| Ogle County | +7.7 | R+29.4 | R+21.7 | 47.4% | 21.6% | 9.7% | 24.6% | 52.6% |
| Monroe County | +7.6 | R+36.3 | R+28.7 | 57.3% | 35.3% | 26.2% | 20.3% | 42.7% |
| Massac County | +7.5 | R+48.8 | R+41.2 | 64.2% | 62.6% | 53.3% | 0.9% | 35.8% |
| Tazewell County | +7.5 | R+26.7 | R+19.2 | 42.6% | 32.9% | 22.6% | 8.2% | 57.3% |
| Fulton County | +7.4 | R+23.8 | R+16.4 | 30.1% | 24.8% | 12.4% | 1.3% | 69.9% |
| Christian County | +7.2 | R+46.7 | R+39.5 | 32.3% | 23.1% | 13.2% | 8.5% | 67.7% |
| Franklin County | +7.1 | R+50.6 | R+43.5 | 47.6% | 44.8% | 38.8% | 1.6% | 52.4% |
| Henderson County | +6.9 | R+38.8 | R+31.9 | 25.7% | 23.4% | 5.6% | 2.3% | 74.2% |
| Bond County | +6.7 | R+44.8 | R+38.0 | 43.5% | 33.8% | 27.3% | 8.5% | 56.5% |
| Henry County | +6.7 | R+24.5 | R+17.8 | 43.5% | 28.9% | 6.2% | 12.6% | 56.4% |
| De Witt County | +6.6 | R+44.9 | R+38.2 | 35.6% | 28.9% | 22.8% | 6.0% | 64.4% |
| White County | +6.6 | R+59.4 | R+52.8 | 66.7% | 63.8% | 56.9% | 2.1% | 33.3% |
| Randolph County | +6.3 | R+50.0 | R+43.6 | 52.1% | 40.4% | 27.7% | 11.2% | 47.9% |
| Lee County | +6.2 | R+22.2 | R+16.0 | 44.7% | 20.4% | 5.8% | 23.0% | 54.2% |
| Jersey County | +6.1 | R+50.2 | R+44.1 | 38.7% | 18.6% | 10.5% | 19.6% | 61.3% |
| Coles County | +6.1 | R+28.5 | R+22.4 | 49.0% | 36.5% | 30.0% | 11.1% | 51.0% |
| Pope County | +6.0 | R+60.1 | R+54.1 | 34.3% | 34.3% | 20.7% | 0.0% | 65.6% |
| Washington County | +6.0 | R+57.2 | R+51.2 | 57.9% | 42.8% | 26.1% | 15.1% | 42.1% |
| Sangamon County | +6.0 | R+5.0 | D+1.0 | 45.8% | 29.1% | 18.9% | 15.3% | 52.9% |
| Richland County | +6.0 | R+53.5 | R+47.5 | 45.5% | 32.6% | 21.9% | 11.1% | 54.5% |
| Knox County | +5.9 | R+9.4 | R+3.5 | 24.6% | 19.4% | 7.9% | 3.6% | 75.4% |
| Mercer County | +5.8 | R+27.1 | R+21.3 | 36.6% | 26.3% | 5.1% | 9.6% | 63.4% |
| Hamilton County | +5.8 | R+63.3 | R+57.5 | 52.6% | 47.7% | 44.8% | 4.9% | 47.4% |
| Edgar County | +5.7 | R+52.4 | R+46.6 | 45.1% | 35.6% | 19.7% | 7.7% | 54.9% |
| Wabash County | +5.7 | R+53.8 | R+48.1 | 47.5% | 36.2% | 28.2% | 11.3% | 52.5% |
| Menard County | +5.7 | R+41.5 | R+35.8 | 42.8% | 29.2% | 20.5% | 13.6% | 57.1% |
| Douglas County | +5.6 | R+46.1 | R+40.5 | 63.1% | 44.5% | 29.5% | 17.0% | 36.8% |
| Iroquois County | +5.3 | R+57.3 | R+52.0 | 43.1% | 35.7% | 23.2% | 6.9% | 56.9% |
| Jo Daviess County | +5.3 | R+16.8 | R+11.6 | 42.2% | 20.3% | 4.1% | 21.9% | 57.4% |
| Bureau County | +5.0 | R+24.3 | R+19.3 | 38.1% | 25.9% | 13.6% | 11.9% | 61.9% |
| Marshall County | +4.9 | R+36.0 | R+31.1 | 34.2% | 26.0% | 12.4% | 8.2% | 65.8% |
| Jefferson County | +4.9 | R+47.8 | R+42.9 | 46.7% | 41.9% | 35.7% | 3.5% | 53.2% |
| Stephenson County | +4.6 | R+19.4 | R+14.8 | 60.1% | 37.4% | 20.9% | 21.2% | 39.9% |
| Ford County | +4.5 | R+47.9 | R+43.4 | 46.5% | 35.9% | 19.6% | 10.5% | 53.5% |
| Johnson County | +4.3 | R+58.3 | R+54.0 | 28.3% | 27.1% | 21.8% | 1.2% | 71.7% |
| Saline County | +4.3 | R+49.0 | R+44.7 | 58.3% | 55.1% | 49.7% | 1.7% | 41.7% |
| Clark County | +3.7 | R+51.2 | R+47.5 | 69.0% | 63.8% | 50.1% | 5.1% | 31.0% |
| Livingston County | +3.6 | R+46.3 | R+42.7 | 41.7% | 31.8% | 11.2% | 8.6% | 58.2% |
| Clinton County | +3.5 | R+51.8 | R+48.3 | 57.9% | 14.0% | 9.6% | 43.6% | 42.0% |
| Crawford County | +3.5 | R+52.4 | R+48.9 | 40.7% | 34.1% | 27.4% | 5.1% | 59.3% |
| Edwards County | +3.5 | R+71.1 | R+67.6 | 56.8% | 56.8% | 42.0% | 0.0% | 43.2% |
| Shelby County | +3.4 | R+60.2 | R+56.9 | 46.8% | 38.6% | 28.6% | 7.7% | 53.2% |
| Moultrie County | +3.3 | R+49.1 | R+45.8 | 69.2% | 58.1% | 48.5% | 11.1% | 30.8% |
| Greene County | +3.3 | R+57.8 | R+54.5 | 53.9% | 42.8% | 19.9% | 11.1% | 46.1% |
| Wayne County | +3.1 | R+70.9 | R+67.8 | 54.5% | 53.8% | 48.0% | 0.7% | 45.4% |
| Logan County | +2.9 | R+41.5 | R+38.6 | 47.3% | 44.3% | 34.5% | 2.7% | 52.7% |
| Stark County | +2.9 | R+45.6 | R+42.7 | 31.8% | 21.6% | 9.8% | 10.2% | 68.1% |
| Pulaski County | +2.8 | R+34.2 | R+31.4 | 62.2% | 62.2% | 53.7% | 0.0% | 36.9% |
| Fayette County | +2.7 | R+64.7 | R+62.0 | 51.5% | 37.0% | 31.0% | 14.5% | 48.5% |
| Carroll County | +2.4 | R+31.7 | R+29.2 | 50.0% | 28.3% | 7.7% | 20.7% | 50.0% |
| Cumberland County | +2.3 | R+61.9 | R+59.5 | 29.6% | 20.3% | 13.8% | 9.4% | 70.4% |
| Union County | +2.3 | R+43.2 | R+40.9 | 44.6% | 42.9% | 38.1% | 1.7% | 55.4% |
| Pike County | +2.1 | R+63.7 | R+61.6 | 43.2% | 31.5% | 21.7% | 10.2% | 56.8% |
| Warren County | +2.1 | R+25.1 | R+23.1 | 34.0% | 24.6% | 12.6% | 9.4% | 65.9% |
| Woodford County | +2.0 | R+42.0 | R+40.0 | 35.9% | 28.6% | 17.9% | 7.3% | 64.0% |
| Clay County | +1.9 | R+67.3 | R+65.4 | 71.1% | 61.4% | 53.5% | 9.7% | 28.9% |
| Marion County | +1.9 | R+49.5 | R+47.6 | 51.2% | 45.0% | 37.9% | 5.1% | 48.7% |
| Effingham County | +1.9 | R+60.4 | R+58.5 | 57.5% | 34.7% | 28.9% | 21.3% | 42.5% |
| Jasper County | +1.6 | R+65.2 | R+63.6 | 43.8% | 27.6% | 19.8% | 16.2% | 56.2% |
| McDonough County | +1.1 | R+18.9 | R+17.8 | 32.1% | 25.8% | 13.1% | 4.6% | 66.4% |
| Morgan County | +1.1 | R+32.5 | R+31.4 | 40.9% | 27.2% | 11.6% | 11.9% | 58.8% |
| Scott County | −0.6 | R+61.2 | R+61.8 | 52.4% | 42.2% | 24.7% | 10.2% | 47.6% |
| Adams County | −0.8 | R+47.4 | R+48.2 | 73.4% | 48.6% | 38.7% | 23.0% | 25.4% |
| Perry County | −1.2 | R+52.0 | R+53.2 | 44.0% | 34.0% | 25.2% | 10.0% | 56.0% |
| Vermilion County | −7.6 | R+35.7 | R+43.3 | 33.8% | 29.0% | 20.6% | 3.3% | 65.4% |
| Hancock County | −8.7 | R+50.0 | R+58.6 | 43.8% | 32.1% | 12.8% | 6.5% | 56.2% |
| Brown County | −8.8 | R+59.9 | R+68.8 | 27.1% | 14.3% | 5.1% | 12.8% | 72.8% |
| Schuyler County | −15.6 | R+46.8 | R+62.4 | 34.2% | 31.9% | 15.5% | 2.2% | 65.8% |
Illinois congressional districts
"House vs. 2024" compares the 2026 House margin with Harris's 2024 margin inside the district's current lines (NBC News's district baseline); it is blank where only one party ran, where two candidates of one party met in a top-two race, or where NBC has no 2024 baseline. "Top race, from its counties" averages the county Dem movement of the district's counties, weighted by each county's House votes.
| District | Winner | House vs. 2024 | Top race, from its counties | 2024 president | 2026 House | Christian | Evangelical | Catholic |
|---|---|---|---|---|---|---|---|---|
| IL-01 | Jackson (D) | — | +17.2 | — | D+40.6 | 44.4% | 8.9% | 27.0% |
| IL-02 | Miller (D) | — | +13.9 | — | D+45.5 | 44.8% | 10.5% | 23.6% |
| IL-03 | Ramirez (D) | — | +16.4 | — | D+51.7 | 49.2% | 8.2% | 31.5% |
| IL-04 | Garcia (D) | — | +17.0 | — | D+54.7 | 47.3% | 7.6% | 29.7% |
| IL-05 | Quigley (D) | +13.5 | +17.0 | D+37.5 | D+51.1 | 46.4% | 7.4% | 29.1% |
| IL-06 | Casten (D) | +19.3 | +16.1 | D+5.7 | D+25.0 | 50.2% | 8.5% | 32.5% |
| IL-07 | Ford (D) | — | +17.2 | — | D+78.0 | 46.5% | 7.4% | 28.9% |
| IL-08 | Bean (D) | — | +16.7 | — | D+29.6 | 49.2% | 8.3% | 32.0% |
| IL-09 | Biss (D) | +14.6 | +16.8 | D+37.0 | D+51.7 | 45.3% | 7.2% | 28.6% |
| IL-10 | Schneider (D) | +17.3 | +14.2 | D+22.3 | D+39.6 | 45.2% | 7.5% | 30.4% |
| IL-11 | Foster (D) | — | +16.0 | — | D+30.7 | 46.8% | 8.3% | 31.1% |
| IL-12 | Bost (R) | +4.8 | +5.9 | R+44.1 | R+39.3 | 48.6% | 29.2% | 10.4% |
| IL-13 | Budzinski (D) | +14.6 | +9.0 | D+10.7 | D+25.3 | 43.7% | 18.8% | 13.5% |
| IL-14 | Underwood (D) | +19.8 | +16.3 | D+5.3 | D+25.1 | 38.8% | 9.0% | 22.8% |
| IL-15 | Miller (R) | +6.6 | +5.4 | R+40.4 | R+33.8 | 46.1% | 22.3% | 12.0% |
| IL-16 | LaHood (R) | +5.8 | +9.0 | R+23.1 | R+17.2 | 43.8% | 15.9% | 15.7% |
| IL-17 | Sorensen (D) | +15.4 | +10.2 | D+4.8 | D+20.2 | 42.0% | 15.0% | 13.4% |
Data: download the full report and all data. Method: how it's measured.