Quincy, Illinois Demographics
Population trends, housing costs, income, commuting, and health, all on one page.
Quincy, 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.
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B
Health Around average
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C
Income Below average
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D
Education Well below average
Source: Map AI Methodology
Population
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| Population | 32,018 | 12,692,444 | 337,468,954 |
| Population density (per sq mi) | 2005.9 | 219.1 | 86.4 |
| Population growth (%/yr) | -0.44% | -0.16% | 0.59% |
| Median age | 37.3 | 37.4 | 37.3 |
| Households | 14,176 | 5,035,584 | 130,235,071 |
Population in Quincy declined by 2.7% from 2009 to 2024, reaching 32,018 in 2024.
Population Growth 2009–2024
Race & Ethnicity
Age & Sex
The largest generation in Quincy is Gen Z, aged 13–28, at 21.5% of residents. That is 0.2 points above Illinois as a whole.
- Gen Z 13–28 6,881 21.5% +0.2 pts
- Millennials 29–44 6,377 19.9% -2.0 pts
- Gen X 45–60 6,131 19.1% -1.2 pts
- Boomers 61–79 5,704 17.8% +0.9 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 50.8% of the people living in Quincy and men 49.2%.
- Women 50.8% Illinois 50.6%
- Men 49.2% Illinois 49.4%
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Economy
Quincy has a the economy index of C, which means it is somewhat prosperous.
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median household income | $56,511 | $84,042 | $80,455 |
| Income growth (%/yr) | 3.79% | 4.46% | 4.80% |
| Unemployment rate | 5.1% | 5.8% | 5.2% |
The median household income in Quincy is about 33% lower than in Illinois.
Housing
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| Median home price | $235,042 | $149,936 | $248,835 |
| Median rent | $837 | $1,274 | $1,407 |
| Homeownership rate | 62.6% | 67.1% | 65.2% |
The median home price in Quincy is about 23.4 years' worth of rent — buying at the median price costs roughly as much as paying the median rent of $837 per month for that long.
Commute Time & Mobility
Commuters in Quincy spend about 24 minutes on the road round trip each working day. Over a typical 250-day work year, that adds up to roughly 99 hours, about 4.1 full days, spent commuting.
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| One-way commute (min) | 11.9 | 23.6 | 22.4 |
| Round-trip commute (min) | 23.9 | 47.3 | 44.8 |
| Yearly time spent (hours) | 99 | 197 | 187 |
| Estimated yearly cost | $3,082 | $6,104 | $5,790 |
| Work from home | 7.7% | 15.9% | 15.0% |
| Highway traffic (vehicles/day) | 3,416 | 7,977 | 8,813 |
| Local road traffic (vehicles/day) | 2,736 | 1,547 | 1,355 |
The average commute time in Quincy is 12 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
Quincy has a education index of D, which means it is barely educated.
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| Bachelor's degree or higher | 25.7% | 34.1% | 31.6% |
| Average household size | 2.16 | 2.46 | 2.53 |
Health
Quincy has a health index of B, which means it is quite healthy.
| Metric | Quincy | Illinois Avg | U.S. Average |
|---|---|---|---|
| Life expectancy (years) | 76.2 | 77.9 | 78.3 |
| Self-rated poor health | 16.4% | 15.6% | 16.3% |
| Smokers | 19.6% | 19.2% | 19.0% |
Frequently Asked Questions
Common questions about Quincy, Illinois.
How big is Quincy, Illinois by population?
About 32,018 people live in Quincy, Illinois, in 14,176 households of 2.2 people on average. The median age is 37.3, close to the U.S. median of 37.3.
How densely populated is Quincy, Illinois?
Averaged over its land area, Quincy, Illinois has 2,006 people per square mile, a density typical of urban and suburban areas. That is about 23 times the U.S. average of 86.
How affordable is housing in Quincy, Illinois?
The median home costs 4.2 times the median household income ($235,042 against $56,511), compared with 3.1 times nationally. A ratio of about 3 is traditionally considered affordable. Median rent of $837 a month takes about 18% of the median household's income, below the 30% level at which HUD considers renters cost-burdened.
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