Monticello, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Monticello, Illinois had a total population of 6,304, the 299th largest city in Illinois, with a median household income of $99,449, which is 19% higher than the state average. The poverty rate is 5.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Housing is very affordable with a home-value-to-income ratio of just 2.1x.
- Near full employment with an unemployment rate of just 0.5%.
Monticello Quick Facts
How Monticello 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 | 6,332 | 6,304 | -0.4% |
| Median household income | $88,611 | $99,449 | +12.2% |
| Median home value | $196,000 | $210,500 | +7.4% |
How Monticello 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
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
Monticello Rankings in Illinois
Explore Illinois Rankings
Other Cities in Piatt County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Bement | 1,792 | $76,250 | 7.0% | $99,300 |
| Cerro Gordo | 1,349 | $77,857 | 11.0% | $109,200 |
| Mansfield | 866 | $78,750 | 8.3% | $142,200 |
| Hammond | 617 | $77,019 | 5.0% | $102,500 |
| De Land | 448 | $50,000 | 13.0% | $87,000 |
| Cisco | 234 | $50,625 | 12.4% | $113,100 |
| LaPlace | 170 | N/A | 35.3% | $86,800 |
| White Heath | 163 | $98,409 | 14.1% | $168,500 |
Cities Similar to Monticello
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Lakemoor | 6,467 | $100,414 | $265,500 | 36.5% | 4.7% |
| Winthrop Harbor | 6,559 | $95,690 | $250,800 | 22.2% | 5.2% |
| Willow Springs | 5,868 | $103,583 | $378,300 | 37.9% | 4.1% |
| Countryside | 6,267 | $80,968 | $324,700 | 37.0% | 10.0% |
| Johnsburg | 6,386 | $121,023 | $328,300 | 24.3% | 12.1% |
Population Overview
Monticello is a small city located in Illinois, within Piatt County. The total population is 6,304. It ranks as the 299th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Monticello is 43.8 years. This is 12% higher than the state median of 39.0 years. 11.1% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Monticello is $99,449. This is 19% higher than the state median of $83,390. It is also 23% higher than the national median of $80,734. The poverty rate stands at 5.7%. This is 51% lower than the state poverty rate of 11.8%. The unemployment rate is 0.5%. This is 92% lower than the state rate of 5.8%. The median home value is $210,500. Housing costs are 20% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.1x, Monticello is one of the most affordable housing markets in the area. 82.7% of occupied housing units are owner-occupied. This homeownership rate is 23% higher than the state average of 67.1%.
Race & Ethnicity
Monticello has a predominantly White (non-Hispanic) population, comprising 94.5% of all residents. Black or African American residents account for 2.7%. The White (non-Hispanic) population is significantly higher than the state average (94.5% vs 58.1%). The Black or African American population (2.7%) is well below the state average of 13.3%. The Hispanic or Latino population (1.9%) is well below the state average of 18.8%. The Asian population (0.9%) is well below the state average of 5.9%.
Education
40.7% of residents aged 25 and older hold a bachelor's degree or higher. This is 8% 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 95.7%.
Data Sources & Methodology
All demographic data for Monticello, 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 Monticello, Illinois?
Monticello, Illinois has a population of 6,304 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Monticello, IL?
The median household income in Monticello is $99,449, which is 23% higher than the national median of $80,734.
What is the poverty rate in Monticello, IL?
The poverty rate in Monticello is 5.7%. This means approximately 357 residents live below the federal poverty line.
What is the racial makeup of Monticello, Illinois?
Monticello's population is 94.5% White, 2.7% Black, 1.9% Hispanic/Latino, and 0.9% Asian.
What is the median home value in Monticello, IL?
The median home value in Monticello is $210,500. The home-value-to-income ratio is 2.1x.
How educated is Monticello, Illinois?
40.7% of adults (25+) in Monticello hold a bachelor's degree or higher, and 13.6% hold a graduate or professional degree.