LaSalle County, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
LaSalle County, IL Population Density Map and Area Scores
Area Score
Health, income and education, each graded from F to A+. Explore interactive maps for deeper analysis.
-
B
Health Around average
-
C
Income Below average
-
D
Education Well below average
Source: Map AI Methodology
Population: density and quick facts
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 108,714 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 94.7 | 219.1 | 86.4 |
| Population growth (%/yr) | -0.36% | -0.16% | 0.59% |
| Median age | 43.4 | 37.4 | 37.3 |
| Households | 45,372 | 5,035,584 | 130,235,071 |
Population in LaSalle County declined by 3.2% from 2009 to 2024, reaching 108,714 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in LaSalle County is Gen X, aged 45–60, at 21.6% of residents. That is 1.2 points above Illinois as a whole.
- Gen Z 13–28 21,184 19.5% -1.8 pts
- Millennials 29–44 21,326 19.6% -2.3 pts
- Gen X 45–60 23,487 21.6% +1.2 pts
- Boomers 61–79 21,109 19.4% +2.5 pts
Residents by birth cohort, from the 2025 age distribution. The right-hand figure is how far each cohort's share sits above or below Illinois, in percentage points. Children younger than Gen Z and the generations before the Boomers are counted in the population but not shown here, so these shares do not add up to 100%.
Male and female share
Women are 49.6% of the people living in LaSalle County and men 50.4%.
- Women 49.6% Illinois 50.6%
- Men 50.4% Illinois 49.4%
How many residents match a customer profile?
Residents matching this profile
100% of everyone living in LaSalle County
Pick an age range and a women/men split and the figure above answers with how many residents that profile reaches.
Economy
LaSalle County has a the economy index of C, which means it is somewhat prosperous.
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $73,482 | $84,042 | $80,455 |
| Income growth (%/yr) | 4.43% | 4.46% | 4.80% |
| Unemployment rate | 5.3% | 5.8% | 5.2% |
The median household income in LaSalle County is about 13% lower than in Illinois.
Housing
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $97,968 | $149,936 | $248,835 |
| Median rent | $928 | $1,274 | $1,407 |
| Homeownership rate | 74.4% | 67.1% | 65.2% |
The median home price in LaSalle County is about 8.8 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $928 per month for that long.
Commute Time & Mobility
Commuters in LaSalle County spend about 37 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 154 hours, about 6.4 full days, spent commuting.
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 18.5 | 23.6 | 22.4 |
| Round-trip commute (min) | 37.1 | 47.3 | 44.8 |
| Yearly time spent (hours) | 154 | 197 | 187 |
| Estimated yearly cost | $4,789 | $6,104 | $5,790 |
| Work from home | 5.1% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 5,419 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 610 | 1,547 | 1,355 |
Fastest commutes among counties in
Illinois:
Edgar County (12.0 min), Brown County (12.7 min), Morgan County (13.1 min).
Slowest:
Calhoun County (43.8 min), Pulaski County (31.2 min), Pope County (31.0 min).
The average commute time in LaSalle County is 19 minutes, shorter than the 24 minutes in Illinois.
Estimated yearly cost applies a single national wage rule of thumb (U.S. Bureau of Labor Statistics average hourly earnings), not a measurement of wages in this area. Traffic volume figures come from proprietary Ticon and TrafficZoom data.
Education & Households
LaSalle County has a education index of D, which means it is barely educated.
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 17.5% | 34.1% | 31.6% |
| Average household size | 2.33 | 2.46 | 2.53 |
Highest education index among counties in
Illinois:
DuPage County (0.4), Champaign County (0.4), Lake County (0.4).
Lowest:
Hardin County (0.2), Fayette County (0.2), Perry County (0.2).
Health
LaSalle County has a health index of B, which means it is quite healthy.
| Metric | LaSalle County | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 77.4 | 77.9 | 78.3 |
| Self-rated poor health | 15.5% | 15.6% | 16.3% |
| Smokers | 19.8% | 19.2% | 19.0% |
Highest health index among counties in
Illinois:
DuPage County (0.8), Champaign County (0.8), Monroe County (0.8).
Lowest:
Alexander County (0.8), Pulaski County (0.8), Gallatin County (0.8).
LaSalle County, IL Compared With Nearby Counties
LaSalle County, IL is the 2nd largest of the 4 counties compared here, 108,714 residents against a local median of 53,223. Where LaSalle County, IL breaks from the counties next to it is commute, sitting 21% below the local median of 23.4 min at 18.5 min. That is the better end of the local range on this measure.
Median household income tells the same story from another angle: $73,482 against a local median of $92,779, 21% below it. The picture is mixed rather than uniform: commute runs ahead of the neighbourhood while median household income runs behind it, so LaSalle County, IL is trading one against the other rather than simply out-performing what surrounds it. The counties themselves spread 14.6 min on commute, so LaSalle County, IL sits at one end of an already wide local range rather than apart from it. LaSalle County, IL has the 2nd lowest commute of the 4 areas compared here.
| Area | Population | Median household income | Median home price | Commute |
|---|---|---|---|---|
| LaSalle County, IL | 108,714 | $73,482 #4/4 | $97,968 #3/4 | 18.5 min #2/4 |
| Grundy County, IL | 53,223 | $92,779 | $110,688 | 23.4 min |
| Kendall County, IL | 137,674 | $110,609 | $332,795 | 30.6 min |
| Livingston County, IL | 35,565 | $73,875 | $25,250 | 16.1 min |
Frequently Asked Questions
Common questions about LaSalle County, Illinois.
What is the population of LaSalle County, Illinois?
About 108,714 people live in LaSalle County, Illinois, in 45,372 households of 2.3 people on average. The median age is 43.4, so residents are older than the U.S. median of 37.3 by about 6 years.
How densely populated is LaSalle County, Illinois?
Averaged over its land area, LaSalle County, Illinois has 95 people per square mile, a density typical of rural areas. That is close to the U.S. average of 86.
How affordable is housing in LaSalle County, Illinois?
The median home costs 1.3 times the median household income ($97,968 against $73,482), compared with 3.1 times nationally. That is within the traditional rule of thumb of about 3 times income. Median rent of $928 a month takes about 15% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
What share of adults in LaSalle County, Illinois have a college degree?
17.5% of adults in LaSalle County, Illinois hold a bachelor's degree or higher (about 1 in 6), well below the U.S. share of 31.6%.
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