County in Illinois
LaSalle County
About 108,700 people, median household income $73,000.
District lines run through LaSalle County, so who represents you here depends on where you live. Search your address to see yours.
Who lives in LaSalle County
Census survey estimates for 2020 to 2024, rounded.
People
- Population
- 108,700
- Median age
- 42.2 years
- Under 18
- 21%
- 65 and over
- 20%
- Veterans, of adults
- 8%
- Speak another language at home
- 8%
Race and ethnicity
- Hispanic or Latino, of any race
- 11%
- White, not Hispanic
- 82%
- Black, not Hispanic
- 3%
- Asian, not Hispanic
- 1%
Income and housing
- Median household income
- $73,000
- Below the poverty line
- 14%
- Bachelor's or higher, adults 25+
- 21%
- Owner-occupied homes
- 74%
- Median home value
- $162,000
2024 vote for president
- Donald Trump, Republican
- 58.5%
- Kamala Harris, Democrat
- 40.0%
- Other candidates
- 1.5%
Votes counted, by precinct. Source: MIT Election Data and Science Lab, precinct returns (public domain).
Represent all of LaSalle County
LaSalle County's districts (10)
U.S. House (2)
- U.S. House District 14
Held by Lauren Underwood, Democratic
Part of LaSalle County: 86,838 people in 2020
- U.S. House District 16
Held by Darin LaHood, Republican
Part of LaSalle County: 22,820 people in 2020
Illinois Senate (3)
- Illinois Senate District 37
Held by Li Arellano, Republican
Part of LaSalle County: 15,121 people in 2020
- Illinois Senate District 38
Held by Sue Rezin, Republican
Part of LaSalle County: 71,635 people in 2020
- Illinois Senate District 53
Held by Chris Balkema, Republican
Part of LaSalle County: 22,902 people in 2020
Illinois House (5)
- Illinois House District 74
Held by Brad Fritts, Republican
Part of LaSalle County: 15,121 people in 2020
- Illinois House District 75
Held by Jed Davis, Republican
Part of LaSalle County: 15,749 people in 2020
- Illinois House District 76
Held by Murri Briel, Democratic
Part of LaSalle County: 55,886 people in 2020
- Illinois House District 105
Held by Dennis Tipsword, Republican
Part of LaSalle County: 2,267 people in 2020
- Illinois House District 106
Held by Jason Bunting, Republican
Part of LaSalle County: 20,635 people in 2020
Towns (33)
Cities, villages and unincorporated communities, with the number of people in the county’s part of each at the 2020 Census.
- Ottawa18,840
- Streator (part)12,416
- Peru (part)9,896
- LaSalle9,582
- Mendota7,061
- Lake Holiday5,687
- Marseilles4,845
- Oglesby3,712
- Sheridan2,431
- Seneca (part)2,347
- Earlville1,613
- North Utica1,323
- Leland951
- Tonica749
- Dayton528
- Grand Ridge515
- Lostant423
- Naplate412
- Millington (part)411
- Ransom308
- Cedar Point266
- Rutland259
- Somonauk (part)236
- Kangley235
9 more towns
- Troy Grove225
- Dana162
- Wedron140
- Harding133
- Serena129
- Leonore121
- Triumph100
- Wenona (part)15
- Dalzell (part)0
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, Demographic and Housing Characteristics. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.