HarrisDemocratic29.9%9,890TrumpRepublican68.6%22,686KennedyIndependent1.3%422
R+38.7- Lead
- 12,796
- Total
- 33,068
- vs nation
- R+37.2
- Turnout
- 64.1%
Akashiccounty
Williamson County, IL
Contests in this Place (89 available)
President34 · 1892–2024 · 3 mapped
▦ precinct · ▥ counties · ▢ no spatial detail
President margin by year
Place winner margin
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
The precinct map shows the 2024 presidential vote; the timeline scrubs the county’s overall result across 1892–2024.
President results by year
2024 turnout 64.1% of 52,033 citizens 18+
BidenDemocratic30.3%10,206TrumpRepublican67.6%22,801JorgensenLibertarian1.2%420
R+37.3- Lead
- 12,595
- Total
- 33,730
- vs nation
- R+41.8
- Turnout
- 65.2%
ClintonDemocratic26.9%8,581TrumpRepublican67.7%21,570JohnsonLibertarian3.1%997
R+40.8- Lead
- 12,989
- Total
- 31,852
- vs nation
- R+42.9
- Turnout
- 61.3%
ObamaDemocratic36.4%10,647RomneyRepublican61.2%17,909JOHNSONLibertarian1.1%331
R+24.8- Lead
- 7,262
- Total
- 29,254
- vs nation
- R+28.7
- Turnout
- —
ObamaDemocratic41.8%12,589McCainRepublican56.5%17,039OtherAll other candidates1.7%513
R+14.8- Lead
- 4,450
- Total
- 30,141
- vs nation
- R+22.0
- Turnout
- —
KerryDemocratic39.0%11,685BushRepublican60.4%18,086OtherAll other candidates0.6%189
R+21.4- Lead
- 6,401
- Total
- 29,960
- vs nation
- R+18.9
- Turnout
- —
GoreDemocratic45.3%12,192BushRepublican52.0%14,012NaderGreen1.8%476
R+6.8- Lead
- 1,820
- Total
- 26,939
- vs nation
- R+7.3
- Turnout
- —
ClintonDemocratic49.5%12,510DoleRepublican38.5%9,734PerotReform11.4%2,877
D+11.0- Lead
- 2,776
- Total
- 25,272
- vs nation
- D+2.5
- Turnout
- —
Key facts
- 2024 presidential margin
- R+38.7MIT Election Lab
- Population
- 66,8762024 5-year
- Population density
- 159 / sq mi2024 5-year · TIGER/Line
- Land area
- 420 sq miTIGER/Line
- Median household income
- $65,6042024 5-year
- White (non-Hispanic)
- 87.9%2024 5-year
- Black
- 4.3%2024 5-year
- Hispanic / Latino
- 2.9%2024 5-year
- Peak Democratic margin
- D+23.1 in 1964MIT Election Lab
- Peak Republican margin
- R+40.8 in 2016MIT Election Lab
- Most similar
- Callaway County, MO · twin score 77.0
Turnout and midterm durability
Participation measured against the same-year citizen voting-age population. Audited cycles count total general-election participants — ballots or participating voters, not presidential candidate votes. Cycles before 2016 predate that series and are derived from the certified presidential returns instead; they are marked everywhere they appear and are excluded from the figures below.
2004–20248 cycles · 5 audited
- 2024 turnout
- 64.1%33,346 participants ÷ 52,033 CVAP
- 2020→2022 drop-off
- +15.9 ptsVolatile
- Drop-off vs state
- -6.2 ptsPositive means a larger decline than the statewide pattern
- Mechanical 2026
- 48.2%–52.7%Recent-cycle and two-cycle persistence scenarios; not a forecast
Participation by cycle
Presidential Midterm Derived, pre-2016
Select a presidential cycle to show it on the map and results ledger above.
| Cycle | Participants | CVAP | Turnout | Series | Quality |
|---|---|---|---|---|---|
| 33,346 | 52,033 ± 282 | 64.1% | Audited | A/A | |
| 2022Mid | 25,540 | 51,837 ± 316 | 49.3% | Audited | C/A |
| 33,730 | 51,762 ± 374 | 65.2% | Audited | C/A | |
| 2018Mid | 28,337 | 52,110 ± 270 | 54.4% | Audited | A/A |
| 31,852 | 51,986 ± 286 | 61.3% | Audited | C/A | |
| 29,254 | 50,998 | 57.4% | Derived | — | |
| 30,141 | 49,778 | 60.6% | Derived | — | |
| 29,960 | 48,558 extrapolated | 61.7% | Derived | — |
Sources and methods
Audited cycles (2016, 2018, 2020, 2022, 2024) count total general-election participants against the same-year CVAP special tabulation, each cell carrying its own numerator and denominator quality grade. Derived cycles (2004, 2008, 2012) come from the certified presidential returns on this page over the ACS 5-year CVAP series, so they measure presidential votes cast rather than ballots — a floor on participation. Where a derived cycle predates the ACS its denominator is extrapolated rather than read, and says so on its own line below. They are shown for the longer arc and are excluded from the drop-off, excess-drop-off, and 2026 scenario figures above.
- 2024: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 311/228.
- 2022: numerator source 159, denominator source 157; top ticket votes; canonical-complete-contest-floor-v1; allocation share 0.0%; series 154/183.
- 2020: numerator source 159, denominator source 157; top ticket votes; canonical-complete-contest-floor-v1; allocation share 0.0%; series 152/2.
- 2018: numerator source 158, denominator source 157; total voters participating; eavs-f1a-v1:observed:native; allocation share 0.0%; series 297/138.
- 2016: numerator source 159, denominator source 157; top ticket votes; canonical-complete-contest-floor-v1; allocation share 0.0%; series 148/111.
- 2012 (derived): Certified presidential returns · ACS 5-year CVAP (B05003); presidential votes cast — a floor on participation, not a ballot count.
- 2008 (derived): Certified presidential returns · ACS 5-year CVAP (B05003); presidential votes cast — a floor on participation, not a ballot count.
- 2004 (derived): Certified presidential returns · extrapolated CVAP denominator; presidential votes cast — a floor on participation, not a ballot count; 2004 predates the ACS, so the denominator is a linear back-extrapolation from the 2008 and 2012 CVAP values, not a read figure.
Interactive election map
One map. Every available contest.
The map and local result cover Williamson County only. The complete contest result is shown below for comparison.
Williamson County result
0 precinct units · 0 candidate votes
JB Pritzker0—
Governor contest result
Loading the complete contest result…
Explore precinct resultsSearch, sort, compare years, or export CSV · 121 precincts
Precinct data
Results by precinct
121 precincts · 33,346 votes
Precinct boundaries and identifiers are cycle-specific. This table does not join rows across years without a validated crosswalk.
| Precinct -LAKE CREEK 3LAKE CREEK 3 | 170 | 676 | 19 | 865 | 19.7% | 78.2% | R+58.5 |
|---|---|---|---|---|---|---|---|
| Precinct -CRAB ORCHARDCRAB ORCHARD | 109 | 737 | 17 | 863 | 12.6% | 85.4% | R+72.8 |
| Precinct -CARTERVILLE 6CARTERVILLE 6 | 284 | 536 | 18 | 838 | 33.9% | 64.0% | R+30.1 |
| Precinct -CREAL SPRINGS 2CREAL SPRINGS 2 | 202 | 613 | 17 | 832 | 24.3% | 73.7% | R+49.4 |
| Precinct -EAST MARION 5EAST MARION 5 | 204 | 593 | 20 | 817 | 25.0% | 72.6% | R+47.6 |
| Precinct -CARTERVILLE 7CARTERVILLE 7 | 311 | 439 | 19 | 769 | 40.4% | 57.1% | R+16.6 |
| Precinct -SOUTHERN 1SOUTHERN 1 | 167 | 585 | 10 | 762 | 21.9% | 76.8% | R+54.9 |
| Precinct -EAST MARION 9EAST MARION 9 | 213 | 519 | 23 | 755 | 28.2% | 68.7% | R+40.5 |
| Precinct -WEST MARION 10WEST MARION 10 | 260 | 474 | 15 | 749 | 34.7% | 63.3% | R+28.6 |
| Precinct -SOUTHERN 2SOUTHERN 2 | 190 | 538 | 16 | 744 | 25.5% | 72.3% | R+46.8 |
| Precinct -BLAIRSVILLE 3BLAIRSVILLE 3 | 209 | 520 | 12 | 741 | 28.2% | 70.2% | R+42.0 |
| Precinct -EAST MARION 8EAST MARION 8 | 197 | 521 | 19 | 737 | 26.7% | 70.7% | R+44.0 |
| Precinct -EAST MARION 4EAST MARION 4 | 116 | 606 | 8 | 730 | 15.9% | 83.0% | R+67.1 |
| Precinct -CARTERVILLE 5CARTERVILLE 5 | 195 | 500 | 22 | 717 | 27.2% | 69.7% | R+42.5 |
| Precinct -HERRIN 07HERRIN 07 | 195 | 500 | 14 | 709 | 27.5% | 70.5% | R+43.0 |
| Precinct -WEST MARION 02WEST MARION 02 | 214 | 486 | 9 | 709 | 30.2% | 68.5% | R+38.4 |
| Precinct -WEST MARION 04WEST MARION 04 | 250 | 431 | 19 | 700 | 35.7% | 61.6% | R+25.9 |
| Precinct -STONEFORTSTONEFORT | 83 | 599 | 17 | 699 | 11.9% | 85.7% | R+73.8 |
| Precinct -HERRIN 04HERRIN 04 | 230 | 421 | 21 | 672 | 34.2% | 62.6% | R+28.4 |
| Precinct -HERRIN 05HERRIN 05 | 145 | 517 | 9 | 671 | 21.6% | 77.0% | R+55.4 |
| Precinct -BLAIRSVILLE 1BLAIRSVILLE 1 | 240 | 404 | 17 | 661 | 36.3% | 61.1% | R+24.8 |
| Precinct -EAST MARION 3EAST MARION 3 | 225 | 379 | 18 | 622 | 36.2% | 60.9% | R+24.8 |
| Precinct -HERRIN 10HERRIN 10 | 218 | 384 | 18 | 620 | 35.2% | 61.9% | R+26.8 |
| Precinct -CARTERVILLE 2CARTERVILLE 2 | 262 | 335 | 22 | 619 | 42.3% | 54.1% | R+11.8 |
| Precinct -EAST MARION 2EAST MARION 2 | 236 | 362 | 15 | 613 | 38.5% | 59.1% | R+20.6 |
| Precinct -WEST MARION 08WEST MARION 08 | 193 | 396 | 22 | 611 | 31.6% | 64.8% | R+33.2 |
| Precinct -LAKE CREEK 1LAKE CREEK 1 | 166 | 430 | 8 | 604 | 27.5% | 71.2% | R+43.7 |
| Precinct -LAKE CREEK 2LAKE CREEK 2 | 142 | 421 | 19 | 582 | 24.4% | 72.3% | R+47.9 |
| Precinct -HERRIN 03HERRIN 03 | 168 | 400 | 12 | 580 | 29.0% | 69.0% | R+40.0 |
| Precinct -WEST MARION 07WEST MARION 07 | 218 | 345 | 13 | 576 | 37.8% | 59.9% | R+22.0 |
| Precinct -CARTERVILLE 3CARTERVILLE 3 | 233 | 318 | 15 | 566 | 41.2% | 56.2% | R+15.0 |
| Precinct -CARTERVILLE 4CARTERVILLE 4 | 200 | 349 | 16 | 565 | 35.4% | 61.8% | R+26.4 |
| Precinct -HERRIN 01HERRIN 01 | 175 | 368 | 15 | 558 | 31.4% | 65.9% | R+34.6 |
| Precinct -EAST MARION 1EAST MARION 1 | 190 | 349 | 14 | 553 | 34.4% | 63.1% | R+28.8 |
| Precinct -WEST MARION 01WEST MARION 01 | 197 | 328 | 10 | 535 | 36.8% | 61.3% | R+24.5 |
| Precinct -CORINTHCORINTH | 76 | 450 | 8 | 534 | 14.2% | 84.3% | R+70.0 |
| Precinct -CREAL SPRINGS 1CREAL SPRINGS 1 | 91 | 432 | 11 | 534 | 17.0% | 80.9% | R+63.9 |
| Precinct -HERRIN 09HERRIN 09 | 146 | 359 | 11 | 516 | 28.3% | 69.6% | R+41.3 |
| Precinct -CARTERVILLE 1CARTERVILLE 1 | 197 | 292 | 20 | 509 | 38.7% | 57.4% | R+18.7 |
| Precinct -CARTERVILLE 8CARTERVILLE 8 | 184 | 309 | 12 | 505 | 36.4% | 61.2% | R+24.8 |
| Precinct -HERRIN 11HERRIN 11 | 141 | 351 | 7 | 499 | 28.3% | 70.3% | R+42.1 |
| Precinct -EAST MARION 6EAST MARION 6 | 129 | 352 | 14 | 495 | 26.1% | 71.1% | R+45.1 |
| Precinct -BLAIRSVILLE 2BLAIRSVILLE 2 | 136 | 340 | 9 | 485 | 28.0% | 70.1% | R+42.1 |
| Precinct -HERRIN 13HERRIN 13 | 149 | 316 | 14 | 479 | 31.1% | 66.0% | R+34.9 |
| Precinct -BLAIRSVILLE 5BLAIRSVILLE 5 | 138 | 325 | 11 | 474 | 29.1% | 68.6% | R+39.5 |
| Precinct -HERRIN 12HERRIN 12 | 161 | 280 | 9 | 450 | 35.8% | 62.2% | R+26.4 |
| Precinct -BLAIRSVILLE 4BLAIRSVILLE 4 | 101 | 337 | 10 | 448 | 22.5% | 75.2% | R+52.7 |
| Precinct -HERRIN 08HERRIN 08 | 162 | 270 | 6 | 438 | 37.0% | 61.6% | R+24.7 |
| Precinct -HERRIN 06HERRIN 06 | 132 | 275 | 12 | 419 | 31.5% | 65.6% | R+34.1 |
| Precinct -WEST MARION 03WEST MARION 03 | 173 | 227 | 16 | 416 | 41.6% | 54.6% | R+13.0 |
| Precinct -GRASSYGRASSY | 161 | 247 | 7 | 415 | 38.8% | 59.5% | R+20.7 |
| Precinct -WEST MARION 06WEST MARION 06 | 137 | 255 | 5 | 397 | 34.5% | 64.2% | R+29.7 |
| Precinct -EAST MARION 7EAST MARION 7 | 104 | 271 | 4 | 379 | 27.4% | 71.5% | R+44.1 |
| Precinct -HERRIN 02HERRIN 02 | 148 | 200 | 8 | 356 | 41.6% | 56.2% | R+14.6 |
| Precinct -WEST MARION 05WEST MARION 05 | 116 | 199 | 12 | 327 | 35.5% | 60.9% | R+25.4 |
| Precinct -WEST MARION 09WEST MARION 09 | 101 | 220 | 6 | 327 | 30.9% | 67.3% | R+36.4 |
| BLAIRSVILLE TWP 1 Voting District17_17199BL01 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 2 Voting District17_17199BL02 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 3 Voting District17_17199BL03 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 4 Voting District17_17199BL04 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 5 Voting District17_17199BL05 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 6 Voting District17_17199BL06 | 0 | 0 | 0 | 0 | — | — | No votes |
| BLAIRSVILLE TWP 7 Voting District17_17199BL07 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 1 Voting District17_17199CA01 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 2 Voting District17_17199CA02 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 3 Voting District17_17199CA03 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 4 Voting District17_17199CA04 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 5 Voting District17_17199CA05 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 6 Voting District17_17199CA06 | 0 | 0 | 0 | 0 | — | — | No votes |
| CARTERVILLE TWP 7 Voting District17_17199CA07 | 0 | 0 | 0 | 0 | — | — | No votes |
| CORINTH TWP Voting District17_17199CR01 | 0 | 0 | 0 | 0 | — | — | No votes |
| CRAB ORCHARD TWP 1 Voting District17_17199CO01 | 0 | 0 | 0 | 0 | — | — | No votes |
| CRAB ORCHARD TWP 2 Voting District17_17199CO02 | 0 | 0 | 0 | 0 | — | — | No votes |
| CREAL SPRINGS TWP 1 Voting District17_17199CS01 | 0 | 0 | 0 | 0 | — | — | No votes |
| CREAL SPRINGS TWP 2 Voting District17_17199CS02 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 1 Voting District17_17199EM01 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 2 Voting District17_17199EM02 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 3 Voting District17_17199EM03 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 4 Voting District17_17199EM04 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 5 Voting District17_17199EM05 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 6 Voting District17_17199EM06 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 7 Voting District17_17199EM07 | 0 | 0 | 0 | 0 | — | — | No votes |
| EAST MARION TWP 8 Voting District17_17199EM08 | 0 | 0 | 0 | 0 | — | — | No votes |
| EM09 EAST MARION TWP Voting District17_17199EM09 | 0 | 0 | 0 | 0 | — | — | No votes |
| EM10 EAST MARION TWP Voting District17_17199EM10 | 0 | 0 | 0 | 0 | — | — | No votes |
| GRASSY TWP Voting District17_17199GR01 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 1 Voting District17_17199HE01 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 10 Voting District17_17199HE10 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 11 Voting District17_17199HE11 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 12 Voting District17_17199HE12 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 13 Voting District17_17199HE13 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 14 Voting District17_17199HE14 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 15 Voting District17_17199HE15 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 16 Voting District17_17199HE16 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 2 Voting District17_17199HE02 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 3 Voting District17_17199HE03 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 4 Voting District17_17199HE04 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 5 Voting District17_17199HE05 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 6 Voting District17_17199HE06 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 7 Voting District17_17199HE07 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 8 Voting District17_17199HE08 | 0 | 0 | 0 | 0 | — | — | No votes |
| HERRIN TWP 9 Voting District17_17199HE09 | 0 | 0 | 0 | 0 | — | — | No votes |
| LAKE CREEK TWP 1 Voting District17_17199LC01 | 0 | 0 | 0 | 0 | — | — | No votes |
| LAKE CREEK TWP 2 Voting District17_17199LC02 | 0 | 0 | 0 | 0 | — | — | No votes |
| LAKE CREEK TWP 3 Voting District17_17199LC03 | 0 | 0 | 0 | 0 | — | — | No votes |
| LAKE CREEK TWP 4 Voting District17_17199LC04 | 0 | 0 | 0 | 0 | — | — | No votes |
| SOUTHERN TWP 1 Voting District17_17199SO01 | 0 | 0 | 0 | 0 | — | — | No votes |
| SOUTHERN TWP 2 Voting District17_17199SO02 | 0 | 0 | 0 | 0 | — | — | No votes |
| STONEFORT TWP 1 Voting District17_17199ST01 | 0 | 0 | 0 | 0 | — | — | No votes |
| STONEFORT TWP 2 Voting District17_17199ST02 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 1 Voting District17_17199WM01 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 10 Voting District17_17199WM10 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 11 Voting District17_17199WM11 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 2 Voting District17_17199WM02 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 3 Voting District17_17199WM03 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 4 Voting District17_17199WM04 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 5 Voting District17_17199WM05 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 6 Voting District17_17199WM06 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 7 Voting District17_17199WM07 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 8 Voting District17_17199WM08 | 0 | 0 | 0 | 0 | — | — | No votes |
| WEST MARION TWP 9 Voting District17_17199WM09 | 0 | 0 | 0 | 0 | — | — | No votes |
presidential history
Party record book
Williamson County, IL · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 · 34 presidential cycles
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Lyndon B. Johnson1964
61.5%
14,613 votes · D+23.1
Runner-up · Franklin D. Roosevelt, 1932 · 58.2%
Republican
Donald Trump2024
68.6%
22,686 votes · R+38.7
Runner-up · Donald Trump, 2016 · 67.7%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Franklin D. Roosevelt1936
14,663votes
53.6% of the vote · D+8.6
Runner-up · Franklin D. Roosevelt, 1940 · 14,645 votes
Republican
Donald Trump2020
22,801votes
67.6% of the vote · R+37.3
Runner-up · Donald Trump, 2024 · 22,686 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
Al Smith1928
+13.8pts D vs U.S.
Place R+3.6 · U.S. R+17.5
Runner-up · Bill Clinton, 1992 · +11.5 pts
Republican
Donald Trump2016
+42.9pts R vs U.S.
Place R+40.8 · U.S. D+2.1
Runner-up · Donald Trump, 2020 · +41.8 pts
current representation
Current officeholders
RPatrick WindhorstState House · 117
RPaul JacobsState House · 118
Seats representing Williamson County, IL. A county elects none of these itself — they are the members for the 1 congressional, 1 state senate and 2 state house districts it falls inside, so parts of the county are represented by different members.
U.S. House elections · 2 House
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row shows U.S. House votes counted inside this Place. “Vote lead” is the local lead here, not necessarily the winner of the full contest.
| Year | Vote lead | Democratic | Republican | Total |
|---|---|---|---|---|
| 2024 | R | 28.1%9,202 | 71.9%23,539 | 32,741 |
| 2020 | R | 27.6%9,121 | 72.4%23,965 | 33,086 |
voter registration
Registered voters
Total registered voters, over time
Registered voters
| Year | Total registered |
|---|---|
| 2016 | 49,961 |
| 2018 | 49,569 |
| 2020 | 49,383 |
| 2022 | 50,213 |
| 2024 | 53,816 |
domestic migration
Who moves in and out
Net migration over time, and who arrivals are — where they came from and what those places vote
+278 net domestic migration · 2025
20112025
Net +513 over 2011–2025 · gain loss
Arrivals reported $52,323 in average income, against $73,933 for residents who stayed — 29% lower. (IRS SOI, 2022–23)
The places arrivals came from lean R+29.7 on average — 9.0 points more Democratic-leaning than Williamson County, IL itself (R+38.7).
Where arrivals came from lean of each source
- Jackson County, IL277D+3.5
- Franklin County, IL258R+50.5
- Saline County, IL97R+49.0
- Johnson County, IL72R+58.3
- Jefferson County, IL40R+47.7
- Union County, IL40R+43.2
Where departures went households, 2022–23
- Jackson County, IL239
- Franklin County, IL212
- Saline County, IL74
- Johnson County, IL67
- St. Clair County, IL39
- Jefferson County, IL31
Migration is one input to a place’s political change, not its cause — a shift can also come from residents changing their minds, generational turnover, or turnout. These figures describe the places people moved between; they do not measure how any mover voted.
| Year | Net domestic migration |
|---|---|
| 2011 | +225 |
| 2012 | +18 |
| 2013 | +563 |
| 2014 | −127 |
| 2015 | −116 |
| 2016 | −62 |
| 2017 | −425 |
| 2018 | −58 |
| 2019 | −359 |
| 2021 | −41 |
| 2022 | −104 |
| 2023 | +308 |
| 2024 | +413 |
| 2025 | +278 |
Williamson County's coalfield heritage once made it a Democratic bedrock, but the region's political realignment over recent decades has produced presidential margins exceeding R+38, among the sharpest swings in downstate Illinois.
Across the recorded series it reached a Democratic high of 23.1 points in 1964 and a Republican high of 40.8 points in 2016. Between 2020 and 2024 the county moved 1.4 points toward the Republican candidate; the 2024 margin was 38.7 points.
A population of 66,876, a 88% non-Hispanic-white share, and a median household income of $65,604 describe the county. The county's voting pattern over the last decade is most similar to that of Callaway County and Steuben County.
Political twins — counties
The counties whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Callaway County
Missouri
77.0twin score
% White% unaffiliated2016 margin
Steuben County
New York
73.9twin score
elasticity% unaffiliated% White
Berkeley County
West Virginia
72.6twin score
% unaffiliatedelasticityIrish ancestry
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
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Williamson County, Illinois. Akashic. https://akashic.app/county/17199/. Accessed May 20, 2026. License: CC BY 4.0.
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Cities & towns in Williamson County
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Frequently asked questions
How did Williamson County, Illinois vote in 2024?
In 2024, Williamson County, Illinois voted Republican by 38.7 points (R+38.7), carried by the Republican candidate. Out of 33,068 votes cast, 9,890 went Democratic and 22,686 went Republican.
When did Williamson County, Illinois last vote Democratic?
The most recent presidential election in which Williamson County, Illinois voted Democratic was 1996.
How many people live in Williamson County, Illinois?
Williamson County, Illinois has a population of 66,876 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Williamson County, Illinois?
Median household income in Williamson County, Illinois is $65,604 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Williamson County, Illinois?
Akashic tracks 38 presidential elections in Williamson County, Illinois from 1876 to 2024. Of those, 9 went Democratic and 25 went Republican.