Quincy, Illinois Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Quincy, Illinois is 39,188 as of the 2023 American Community Survey, making it the 44th-largest city in Illinois. The median household income is $56,372, the median home value is $146,100, and the median age is 40.1.
The population has declined 4.8% since 2010 (40,761 → 38,786).
39,188
Population
2461
People / sq mi
$56,372
Median Income
$146,100
Median Home Value
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Quincy covers 15.9 sq mi of land at 2461 people per square mile.
About Quincy, IL
In Quincy, home values do the distinguishing — a median of $146,100. With 39,188 residents, Quincy is a city in Illinois. It ranks #44 among cities in Illinois by population.
The typical household earns $56,372, below the US median of $78,538. The poverty rate is 10.1%, below the national 12.4%. Homes are comparatively cheap — a median value of $146,100, with typical rent around $824.
Roughly 26.6% of adults have a bachelor’s, below the national 35.0%. Most workers commute: only 7.3% work from home, below the national 14.0%, and the average commute runs about 14 minutes each way.
Quincy city Population History (2010-2024)
The city of Quincy city had a population of 40,761 in 2010 and 38,786 in 2024, a -4.8% growth over 14 years. The peak was 40,894 in 2011. Average annual growth rate: -0.35%.
38,786
Population (2024)
40,761
Population (2010)
40,894
Peak (2011)
-0.35%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 40,761 |
| 2011 | 40,894 |
| 2012 | 40,828 |
| 2013 | 40,771 |
| 2014 | 40,739 |
| 2015 | 40,691 |
| 2016 | 40,491 |
| 2017 | 40,270 |
| 2018 | 40,048 |
| 2019 | 39,949 |
| 2020 | 39,575 |
| 2021 | 39,275 |
| 2022 | 38,980 |
| 2023 | 38,959 |
| 2024 | 38,786 |
Race & Ethnicity
| White | 87.2% |
| Black or African American | 5.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 0.8% |
| Two or More Races | 0.0% |
Economy & Income
$56,372
Median Household Income
$34,819
Per Capita Income
10.1%
Poverty Rate
2.7%
Unemployment Rate
Housing
$146,100
Median Home Value
$824
Median Rent
64.8%
Owner-Occupied
Education
92.3%
High School+
26.6%
Bachelor's+
Commute
0.9%
Drive Alone
77.8%
Public Transit
7.3%
Work From Home
13.9 min
Avg Commute
Community Profile
23.4%
Foreign Born
96.7%
Non-English at Home
8.1%
Veterans
18.8%
With Disability
95.8%
Health Insurance
88.9%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 27.8% |
| Manufacturing | 14.7% |
| Education, Health Care & Social Services | 7.4% |
| Finance, Insurance & Real Estate | 6.5% |
| Information | 5.8% |
| Arts, Entertainment & Food Services | 4.7% |
| Public Administration | 4.7% |
| Retail Trade | 4.2% |
| Construction | 3.5% |
| Transportation & Warehousing | 1.5% |
| Agriculture & Mining | 1.4% |
Largest cities in Illinois
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City rankings
Frequently Asked Questions
Quincy, Illinois has a population of 39,188 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 44th-largest city in Illinois.
The median household income in Quincy, Illinois is $56,372, with 10.1% of residents living below the federal poverty level.
The median home value in Quincy, Illinois is $146,100, with median monthly rent at $824 and a homeownership rate of 64.8%.
The median age in Quincy, Illinois is 40.1 years. The population is 48.1% male and 51.9% female.
The population has declined 4.8% since 2010 (40,761 → 38,786).
Where to stay in Quincy
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.