Knollwood, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Knollwood, Illinois had a total population of 1,864, the 525th largest community in Illinois, with a median household income of $138,618, which is 66% higher than the state average. The poverty rate is 7.8%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 66% above the state average — one of the wealthiest communities in Illinois.
Knollwood Quick Facts
How Knollwood Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 1,907 | 1,864 | -2.3% |
| Median household income | $133,452 | $138,618 | +3.9% |
| Median home value | $372,500 | $393,000 | +5.5% |
How Knollwood Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Knollwood Rankings in Illinois
Explore Illinois Rankings
Other Cities in Lake County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Waukegan | 89,076 | $71,919 | 15.3% | $190,900 |
| Mundelein | 31,915 | $108,340 | 8.2% | $309,700 |
| North Chicago | 30,643 | $60,172 | 24.5% | $159,600 |
| Gurnee | 30,510 | $119,628 | 5.2% | $344,300 |
| Highland Park | 30,398 | $168,094 | 4.2% | $607,300 |
| Round Lake Beach | 27,079 | $86,059 | 14.8% | $199,200 |
| Vernon Hills | 26,876 | $121,943 | 6.1% | $412,300 |
| Zion | 24,600 | $63,104 | 16.0% | $183,800 |
| Grayslake | 20,929 | $113,972 | 6.3% | $309,500 |
| Libertyville | 20,525 | $165,667 | 4.2% | $512,000 |
Cities Similar to Knollwood
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Port Byron | 1,854 | $111,667 | $278,200 | 36.9% | 7.3% |
| Hudson | 1,918 | $110,000 | $224,700 | 44.0% | 2.4% |
| Lake Camelot | 1,629 | $133,656 | $236,400 | 39.0% | 0.0% |
| The Galena Territory | 1,735 | $117,548 | $324,700 | 56.5% | 2.5% |
| Prairie Grove | 2,165 | $141,389 | $467,600 | 60.3% | 3.6% |
Population Overview
Knollwood is a small community located in Illinois, within Lake County. The total population is 1,864. It ranks as the 525th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Knollwood is 36.4 years. This is 7% lower than the state median of 39.0 years. With 36.6% of the population under 18, Knollwood has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in Knollwood is $138,618. This is 66% higher than the state median of $83,390. It is also 72% higher than the national median of $80,734. The poverty rate stands at 7.8%. This is 34% lower than the state poverty rate of 11.8%. The survey records no unemployed residents in Knollwood, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $393,000. Housing costs are 49% higher than the state median of $263,300. With a home-value-to-income ratio of just 2.8x, Knollwood is one of the most affordable housing markets in the area. 77.8% of occupied housing units are owner-occupied. This homeownership rate is 16% higher than the state average of 67.1%.
Race & Ethnicity
The largest racial or ethnic group in Knollwood is White (non-Hispanic), making up 73.2% of the population. Hispanic or Latino residents account for 18.8%. The Black or African American population (6.2%) is well below the state average of 13.3%. The Asian population (1.8%) is well below the state average of 5.9%.
Education
43.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 14% higher than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.6%.
Data Sources & Methodology
All demographic data for Knollwood, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Knollwood, Illinois?
Knollwood, Illinois has a population of 1,864 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Knollwood, IL?
The median household income in Knollwood is $138,618, which is 72% higher than the national median of $80,734.
What is the poverty rate in Knollwood, IL?
The poverty rate in Knollwood is 7.8%. This means approximately 138 residents live below the federal poverty line.
What is the racial makeup of Knollwood, Illinois?
Knollwood's population is 73.2% White, 6.2% Black, 18.8% Hispanic/Latino, and 1.8% Asian.
What is the median home value in Knollwood, IL?
The median home value in Knollwood is $393,000. The home-value-to-income ratio is 2.8x.
How educated is Knollwood, Illinois?
43.2% of adults (25+) in Knollwood hold a bachelor's degree or higher, and 8.5% hold a graduate or professional degree.