Quincy, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, Quincy, Illinois had a total population of 39,109, the 44th largest city in Illinois, with a median household income of $56,480, which is 32% lower than the state average. The poverty rate is 16.7%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 32% below the state average, indicating significant economic challenges.
Quincy Quick Facts
How Quincy 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 | 39,188 | 39,109 | -0.2% |
| Median household income | $56,372 | $56,480 | +0.2% |
| Median home value | $146,100 | $153,200 | +4.9% |
How Quincy 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+)
Quincy Rankings in Illinois
Explore Illinois Rankings
Other Cities in Adams County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Camp Point | 1,230 | $62,188 | 14.9% | $127,800 |
| Mendon | 1,167 | $65,781 | 15.7% | $111,600 |
| Payson | 1,100 | $60,478 | 12.4% | $132,000 |
| Ursa | 726 | $64,375 | 10.7% | $161,900 |
| Golden | 693 | $55,000 | 6.4% | $122,800 |
| Clayton | 602 | $66,136 | 12.7% | $91,500 |
| Liberty | 409 | $78,977 | 6.4% | $137,500 |
| Loraine | 341 | $58,750 | 8.8% | $83,600 |
| Lima | 224 | $74,375 | 4.9% | $88,800 |
| Coatsburg | 209 | $63,750 | 6.2% | $81,700 |
Cities Similar to Quincy
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Rock Island | 36,151 | $59,041 | $125,900 | 24.5% | 21.0% |
| Belleville | 41,370 | $63,535 | $141,300 | 28.0% | 14.6% |
| Urbana | 39,341 | $45,346 | $184,900 | 56.8% | 28.0% |
| Calumet City | 35,100 | $55,369 | $145,200 | 21.4% | 23.4% |
| DeKalb | 40,443 | $46,481 | $204,700 | 33.7% | 24.9% |
Population Overview
Quincy is a mid-sized community located in Illinois, within Adams County. The total population is 39,109. It ranks as the 44th most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in Quincy is 39.7 years. This is 2% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in Quincy is $56,480. This is 32% lower than the state median of $83,390. It is also 30% lower than the national median of $80,734. The poverty rate stands at 16.7%. This is 41% higher than the state poverty rate of 11.8%. The unemployment rate is 4.7%. This is 20% lower than the state rate of 5.8%. The median home value is $153,200. Housing costs are 42% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.7x, Quincy is one of the most affordable housing markets in the area. 63.6% of occupied housing units are owner-occupied. This homeownership rate is 5% lower than the state average of 67.1%.
Race & Ethnicity
Quincy has a predominantly White (non-Hispanic) population, comprising 86.0% of all residents. Black or African American residents account for 4.2%. The Black or African American population (4.2%) is well below the state average of 13.3%. The Hispanic or Latino population (2.5%) is well below the state average of 18.8%. The Asian population (1.0%) is well below the state average of 5.9%.
Education
27.8% of residents aged 25 and older hold a bachelor's degree or higher. This is 26% lower 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 92.5%.
Data Sources & Methodology
All demographic data for Quincy, 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.
Free data download: Get all Illinois city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Quincy, Illinois?
Quincy, Illinois has a population of 39,109 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Quincy, IL?
The median household income in Quincy is $56,480, which is 30% lower than the national median of $80,734.
What is the poverty rate in Quincy, IL?
The poverty rate in Quincy is 16.7%. This means approximately 6,282 residents live below the federal poverty line.
What is the racial makeup of Quincy, Illinois?
Quincy's population is 86.0% White, 4.2% Black, 2.5% Hispanic/Latino, and 1.0% Asian.
What is the median home value in Quincy, IL?
The median home value in Quincy is $153,200. The home-value-to-income ratio is 2.7x.
How educated is Quincy, Illinois?
27.8% of adults (25+) in Quincy hold a bachelor's degree or higher, and 9.6% hold a graduate or professional degree.