Illinois State House District 100

State Legislative District Profile (Lower Chamber)

Overview

District ID
il-hd-100
State
Illinois
Chamber
Lower chamber
District Code
100
Land Area
3,376.7 sq mi
Water Area
70.4 sq mi

Boundary

Boundary of Illinois State House District 100

Boundary as GeoJSON

Source: U.S. Census Bureau TIGER/Line state legislative district boundaries.

Counties

CountyOverlapShare of district landShare of county land
Pike County831.35 sq mi24.6%100.0%
Greene County543.04 sq mi16.1%100.0%
Macoupin County432.86 sq mi12.8%50.2%
Jersey County369.66 sq mi10.9%100.0%
Adams County259.89 sq mi7.7%30.4%
Calhoun County253.83 sq mi7.5%100.0%
Scott County250.79 sq mi7.4%100.0%
Morgan County232.64 sq mi6.9%40.9%
Madison County110.28 sq mi3.3%15.4%
Brown County92.33 sq mi2.7%30.2%

Showing all 10 counties

Places

PlaceOverlapShare of district landShare of place land
Godfrey village29.22 sq mi0.9%84.9%
Jerseyville city5.24 sq mi0.2%100.0%
Pittsfield city4.78 sq mi0.1%100.0%
Grafton city3.71 sq mi0.1%100.0%
White Hall city2.58 sq mi0.1%100.0%
Adams CDP2.24 sq mi0.1%100.0%
Hardin village2.13 sq mi0.1%100.0%
Brighton village1.92 sq mi0.1%100.0%
Carrollton city1.90 sq mi0.1%100.0%
Batchtown village1.86 sq mi0.1%100.0%
Hull village1.83 sq mi0.1%100.0%
Greenfield city1.71 sq mi0.1%100.0%
Holiday Shores CDP1.52 sq mi<0.1%96.4%
Pearl village1.51 sq mi<0.1%100.0%
Barry city1.43 sq mi<0.1%100.0%
Beverly CDP1.38 sq mi<0.1%100.0%
Shipman town1.32 sq mi<0.1%100.0%
Bunker Hill city1.27 sq mi<0.1%99.5%
Payson village1.17 sq mi<0.1%100.0%
Winchester city1.13 sq mi<0.1%100.0%
Roodhouse city1.13 sq mi<0.1%100.0%
Griggsville city1.11 sq mi<0.1%100.0%
Elsah village1.09 sq mi<0.1%100.0%
Manchester village1.06 sq mi<0.1%100.0%
New Salem village1.05 sq mi<0.1%100.0%

Showing top 25 of 78 places

Overlapping Congressional Districts

Congressional districtPopulation in bothShare of this district's populationShare of the congressional district's populationShare of this district's land
IL District 1587,13980.2%11.6%85.1%
IL District 1321,56819.8%2.9%14.9%

Source: U.S. Census Bureau 2020 blocks and 2025 block equivalency files (119th Congress, 2024 state legislative plans).

Voters

Registered Voters
80,775
Active Voters
79,185 (98.0%)

Party Registration

This state's voter file does not record party registration.

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202615,424 (19.1%)0 (0.0%)<10 (—)
2023–202459,653 (73.9%)2,779 (3.4%)11,706 (14.5%)
2021–202246,537 (57.6%)3,270 (4.0%)15,369 (19.0%)
2019–202054,184 (67.1%)6,634 (8.2%)10,510 (13.0%)
2017–201842,080 (52.1%)5,226 (6.5%)10,150 (12.6%)
2015–201645,632 (56.5%)8,501 (10.5%)17,200 (21.3%)
2013–201433,219 (41.1%)5,077 (6.3%)7,159 (8.9%)
2011–201237,570 (46.5%)5,223 (6.5%)8,366 (10.4%)

Turnout counts today's registered voters with a counted ballot in the cycle's elections (the odd and even year), as a share of today's registered voters. Voters who have since left the rolls are not counted.

Browse the voter list for this district (premium access; sign-in required)

Source: Civitech voter file snapshot as of 12/15/2025. These are registered voters, separate from the Census population figures. Counts under 10 are suppressed and shown as "<10".

Demographics

Total Population
106,400 (± 1,166)
Median Age
45.4
Median Household Income
$77,549 (± $2,333)
High School Graduate or Higher (age 25+)
93.2%
Bachelor's Degree or Higher (age 25+)
23.3%

Population by Age

GroupPeopleShare
Under 1822,39921.1%
18 to 6460,76457.1%
65 and over23,23721.8%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)1,9191.8%
White, not Hispanic99,88993.9%
Black, not Hispanic1,4611.4%
Asian, not Hispanic4920.5%
American Indian / Alaska Native, not Hispanic660.1%
Native Hawaiian / Pacific Islander, not Hispanic760.1%
Some other race, not Hispanic940.1%
Two or more races, not Hispanic2,4032.3%

Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates (tables B01001, B01002, B01003, B03002, B15003, B19013) for this state legislative district. Estimates are survey-based; ± figures are 90% margins of error.

Citizen Voting Age Population

Total Citizen Population
106,021
Citizen Voting Age Population (CVAP)
83,635

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic104,21398.3%
Hispanic1,8101.7%
White100,54894.8%
Black1,4821.4%
Asian3820.4%
American Indian / Alaska Native700.1%
Native Hawaiian / Pacific Islander780.1%
Two or More Races1490.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic82,59498.8%
Hispanic1,0451.2%
White80,03495.7%
Black1,2561.5%
Asian4340.5%
American Indian / Alaska Native6980.8%
Native Hawaiian / Pacific Islander710.1%
Two or More Races1410.2%

Source: Redistricting Data Hub / U.S. Census Bureau CVAP Special Tabulation (2020-2024 ACS 5-year).