Illinois State House District 105

State Legislative District Profile (Lower Chamber)

Overview

District ID
il-hd-105
State
Illinois
Chamber
Lower chamber
District Code
105
Land Area
1,546.9 sq mi
Water Area
38.8 sq mi

Boundary

Boundary of Illinois State House District 105

Boundary as GeoJSON

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

Counties

CountyOverlapShare of district landShare of county land
Woodford County376.24 sq mi24.3%71.3%
Livingston County327.82 sq mi21.2%31.4%
Marshall County314.91 sq mi20.4%81.4%
Putnam County160.10 sq mi10.3%100.0%
McLean County138.16 sq mi8.9%11.7%
LaSalle County129.35 sq mi8.4%11.4%
Bureau County52.14 sq mi3.4%6.0%
Tazewell County37.03 sq mi2.4%5.7%
Peoria County11.17 sq mi0.7%1.8%

Showing all 9 counties

Places

PlaceOverlapShare of district landShare of place land
Pontiac city8.24 sq mi0.5%97.6%
Washington city7.13 sq mi0.5%83.3%
Normal town5.52 sq mi0.4%29.5%
Hennepin village5.31 sq mi0.3%100.0%
Eureka city2.68 sq mi0.2%98.1%
Minonk city2.40 sq mi0.2%100.0%
Metamora village2.26 sq mi0.1%99.3%
East Peoria city2.14 sq mi0.1%10.3%
El Paso city2.03 sq mi0.1%94.4%
Henry city1.80 sq mi0.1%100.0%
Chillicothe city1.76 sq mi0.1%33.4%
Lacon city1.60 sq mi0.1%97.8%
Bureau Junction village1.45 sq mi0.1%90.1%
Tonica village1.36 sq mi0.1%100.0%
Lexington city1.34 sq mi0.1%65.2%
Granville village1.31 sq mi0.1%100.0%
Gridley village1.23 sq mi0.1%100.0%
Hopewell village1.14 sq mi0.1%100.0%
Lostant village1.12 sq mi0.1%99.3%
Mark village1.06 sq mi0.1%100.0%
Toluca city1.06 sq mi0.1%100.0%
Bloomington city1.00 sq mi0.1%3.7%
Roanoke village0.94 sq mi0.1%100.0%
Streator city0.82 sq mi0.1%11.3%
Hudson village0.82 sq mi0.1%99.9%

Showing top 25 of 47 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 1690,62783.4%12.0%93.1%
IL District 211,65510.7%1.5%1.0%
IL District 144,6894.3%0.6%5.8%
IL District 171,6871.6%0.2%<0.1%

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

Voters

Registered Voters
77,896
Active Voters
74,124 (95.2%)

Party Registration

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

Turnout by Cycle

CycleGeneralDemocratic PrimaryRepublican Primary
2025–202618,578 (23.8%)0 (0.0%)824 (1.1%)
2023–202456,815 (72.9%)3,161 (4.1%)11,852 (15.2%)
2021–202243,910 (56.4%)3,258 (4.2%)14,938 (19.2%)
2019–202050,881 (65.3%)7,509 (9.6%)9,084 (11.7%)
2017–201838,558 (49.5%)5,323 (6.8%)13,334 (17.1%)
2015–201641,699 (53.5%)7,089 (9.1%)19,794 (25.4%)
2013–201428,693 (36.8%)2,092 (2.7%)11,848 (15.2%)
2011–201232,894 (42.2%)1,523 (2.0%)11,390 (14.6%)

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
108,391 (± 1,787)
Median Age
41.5
Median Household Income
$85,019 (± $2,224)
High School Graduate or Higher (age 25+)
93.6%
Bachelor's Degree or Higher (age 25+)
34.0%

Population by Age

GroupPeopleShare
Under 1825,28323.3%
18 to 6462,09657.3%
65 and over21,01219.4%

Population by Race and Hispanic Origin

GroupPeopleShare
Hispanic or Latino (any race)4,0023.7%
White, not Hispanic97,38689.8%
Black, not Hispanic1,9411.8%
Asian, not Hispanic2,4572.3%
American Indian / Alaska Native, not Hispanic880.1%
Native Hawaiian / Pacific Islander, not Hispanic20.0%
Some other race, not Hispanic2920.3%
Two or more races, not Hispanic2,2232.1%

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
106,719
Citizen Voting Age Population (CVAP)
81,571

Citizen Population by Race/Ethnicity

GroupCitizensShare
Non-Hispanic103,14296.6%
Hispanic3,5753.3%
White98,07991.9%
Black1,9201.8%
Asian1,6321.5%
American Indian / Alaska Native800.1%
Native Hawaiian / Pacific Islander10.0%
Two or More Races610.1%

Citizen Voting Age Population by Race/Ethnicity

GroupCVAPShare
Non-Hispanic79,20597.1%
Hispanic2,3682.9%
White75,93393.1%
Black1,8812.3%
Asian9941.2%
American Indian / Alaska Native3910.5%
Native Hawaiian / Pacific Islander20.0%
Two or More Races210.0%

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