City · Illinois
Quincy, Illinois
Quincy, city, in Adams County, Illinois. Quincy had 38,918 residents on July 1, 2025 by the Census Bureau's estimate, down 1.8% since 2020; the 2020 Census counted 39,463 and the ACS 2020-2024 5-year estimates put it at 39,109 (±28). GEOID 1762367.
Residents, July 2025 estimate
38,918
Census Bureau estimate (no margin published)
2020 Census count: 39,463 · ACS 2020-2024: 39,109 ±28
Median household income
$56,480
±$4,119 (90% margin)
Illinois: $83,390
Median home value
$153,200
±$5,462 (90% margin)
Illinois: $263,300
Median gross rent
$837
±$49 (90% margin)
Illinois: $1,274
Where is Quincy and what county is it in?
Quincy is a city in Adams County, Illinois. It covers 15.9 square miles of land, 2,479 residents per square mile in 2020.
Quincy is in the Quincy, IL-MO micropolitan statistical area, which takes in 2 counties (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Quincy, and is it growing?
The Census Bureau estimates that 38,918 people lived in Quincy on July 1, 2025, down 1.8% since 2020, a steeper fall than Illinois's (−0.8%). The 2020 Census counted 39,463 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 39,109 (±28).
| Measure | Quincy | Adams County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 39,109 ±28 | 64,754 | −1,171 |
| Households | 17,620 ±381 | 27,915 | no clear change |
| Average household size | 2.13 ±0.05 | 2.25 | −0.13 |
| Housing units | 19,139 ±293 | 30,302 | no clear change |
Quincy's population since 2000
From 40,366 in 2000 to 38,918 in 2025: down 3.6%. The 2000, 2010 and 2020 figures are census counts, each for Quincy as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Quincy?
The median resident of Quincy is 39.7 years old; 21.5% are under 18 and 20.3% are 65 or older. The largest group is non-Hispanic white residents at 86.0%, then non-Hispanic residents of two or more races at 6.0%. 1.8% of residents were born outside the United States.
| Measure | Quincy | Adams County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 39.7 ±1.0 | 41.4 | no clear change |
| Under 18 years | 21.5% ±1.0 pts | 22.5% | – |
| 65 years and over | 20.3% ±1.0 pts | 20.6% | – |
| Male | 49.0% ±1.0 pts | 49.3% | – |
| Hispanic or Latino (any race) | 2.5% ±0.4 pts | 2.1% | +0.7 pts |
| White alone, not Hispanic | 86.0% ±0.8 pts | 90.0% | −2.5 pts |
| Black or African American alone, not Hispanic | 4.2% ±0.7 pts | 2.8% | −2.1 pts |
| Asian alone, not Hispanic | 1.0% ±0.2 pts | 0.7% | no clear change |
| American Indian and Alaska Native alone, not Hispanic | 0.1% ±0.1 pts | 0.1% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0% ±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 6.0% ±0.7 pts | 4.1% | – |
| Some other race alone, not Hispanic | 0.2% ±0.3 pts | 0.2% | – |
| Born outside the United States | 1.8% ±0.4 pts | 1.2% | no clear change |
| Speak a language other than English at home (age 5+) | 3.1% ±0.8 pts | 2.4% | – |
| Civilian veterans (age 18+) | 7.9% ±1.3 pts | 7.7% | – |
| With a disability | 19.2% ±1.8 pts | 18.1% | – |
| No health insurance coverage | 3.8% ±0.8 pts | 4.4% | no clear change |
| High school graduate or higher (age 25+) | 92.5% ±1.4 pts | 93.8% | – |
| Bachelor's degree or higher (age 25+) | 27.8% ±2.2 pts | 27.5% | +3.9 pts |
| Graduate or professional degree (age 25+) | 9.6% ±1.4 pts | 8.8% | – |
| Lived in the same house a year earlier | 85.3% ±2.0 pts | 88.7% | – |
| Moved from another state in the past year | 3.6% ±1.0 pts | 2.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Quincy earn?
Half of Quincy's 17,620 households earn less than $56,480 a year (±$4,119), against $66,220 in Adams County and $83,390 in Illinois. In 2015-2019 it was $56,845 in 2024 dollars; the margins of error cannot tell the two periods apart. 16.7% of residents live below the poverty line.
| Measure | Quincy | Adams County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $56,480 ±$4,119 | $66,220 | no clear change |
| Mean household income | $78,604 ±$5,281 | $85,695 | – |
| Per capita income | $36,040 ±$2,230 | $37,595 | no clear change |
| People below the poverty line | 16.7% ±2.4 pts | 12.8% | no clear change |
| Children under 18 below the poverty line | 19.7% ±6.1 pts | 14.3% | no clear change |
| Households receiving SNAP | 15.5% ±2.2 pts | 12.4% | – |
| Households with a computer | 91.8% ±1.6 pts | 91.7% | – |
| Households with a broadband subscription | 86.9% ±2.1 pts | 86.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Quincy?
Owners occupy 63.6% of Quincy's occupied homes and renters 36.4%. The median owner-occupied home is valued at $153,200 by its owner (±$5,462). The median renter pays $837 a month including utilities, and 36.0% of renters pay 35% or more of their income on rent.
| Measure | Quincy | Adams County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $153,200 ±$5,462 | $162,600 | +$10,070 |
| Median gross rent | $837 ±$49 | $828 | no clear change |
| Renters paying 35% or more of income on rent | 36.0% ±5.1 pts | 34.6% | no clear change |
| Median monthly owner costs, with a mortgage | $1,197 ±$41 | $1,279 | – |
| Owner-occupied homes | 63.6% ±2.7 pts | 72.1% | no clear change |
| Renter-occupied homes | 36.4% ±2.7 pts | 27.9% | – |
| Housing units | 19,139 ±293 | 30,302 | no clear change |
| Homeowner vacancy rate | 0.3% ±0.5 pts | 0.2% | – |
| Rental vacancy rate | 4.5% ±2.0 pts | 4.3% | – |
| Single-family detached homes | 69.6% ±2.4 pts | 76.3% | – |
| Mobile homes | 2.2% ±0.8 pts | 4.5% | – |
| Built 2020 or later | 0.3% ±0.3 pts | 0.3% | – |
| Built 2010 to 2019 | 4.4% ±1.0 pts | 4.7% | – |
| Built 1939 or earlier | 26.4% ±2.4 pts | 23.0% | – |
| Households with no vehicle | 10.6% ±1.8 pts | 7.5% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Quincy building?
Builders took permits for 28 new housing units in Quincy in 2025 (23 in single-family houses; the permit office reported 11 of 12 months), 0.7 per 1,000 residents against 1.5 across Illinois.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Quincy work and get to work?
77.1% of Quincy's workers drive alone and 8.0% work from home. The average trip to work takes 13.6 minutes. The unemployment rate in 2020-2024 averaged 4.7%.
| Measure | Quincy | Adams County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 64.2% ±2.1 pts | 65.2% | – |
| Unemployment rate | 4.7% ±1.0 pts | 3.9% | no clear change |
| Drove alone to work | 77.1% ±3.0 pts | 79.5% | – |
| Carpooled | 8.8% ±1.8 pts | 8.3% | – |
| Public transportation | 0.7% ±0.4 pts | 0.4% | – |
| Walked | 3.4% ±1.1 pts | 2.6% | – |
| Worked from home | 8.0% ±1.7 pts | 7.6% | +3.5 pts |
| Mean travel time to work | 13.6 min ±0.9 | 16.9 min | no clear change |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Quincy?
12 census tracts lie mostly in Quincy, and 3 more reach into it (2020 census blocks). Their median household incomes run from $18,784 (Tract 7) to $75,117 (Tract 2.02).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 11Adams County | 7,925 | $72,411 |
| Tract 10.01Adams County | 3,933 | $67,813 |
| Tract 6Adams County | 3,931 | $72,907 |
| Tract 4Adams County | 3,451 | $42,219 |
| Tract 1Adams County | 4,219 | $69,851 |
| Tract 2.02Adams County | 3,033 | $75,117 |
| Tract 10.02Adams County | 2,820 | $62,975 |
| Tract 9Adams County | 2,400 | $43,618 |
| Tract 8Adams County | 2,345 | $35,417 |
| Tract 2.01Adams County | 1,889 | $57,417 |
| Tract 5Adams County | 1,808 | $41,417 |
| Tract 105Adams County | 3,123 | $80,182 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Quincy) · Census block assignment files
How does Quincy compare with other places in Illinois?
By the Census Bureau's July 2025 estimates, Quincy is the 1,065th-most populous of the 19,476 U.S. incorporated places that have one and the 45th-most populous of 1,294 in Illinois.
Quincy ranks 1,173rd of 1,380 places in Illinois with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 45th | 1,294 |
| Growth 2020-2025 (PEP) | 637th | 1,347 |
| Residents per square mile | 207th | 1,383 |
| Median household income | 1,173rd | 1,380 |
| Per capita income | 831st | 1,383 |
| Median home value | 808th | 1,379 |
| Median gross rent | 875th | 1,280 |
| Poverty rate | 219th | 1,119 |
| Bachelor's degree or higher | 538th | 1,369 |
| Median age | 851st | 1,383 |
| Owner-occupied share | 1,221st | 1,382 |
| Work from home | 747th | 1,015 |
| Travel time to work | 1,370th | 1,382 |
Quincy's figures with every place in Illinois (CSV)
Every place in Illinois, sortable · Compare Quincy with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Quincy?
5 of the 57 figures for Quincy on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Quincy are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' public schools in Quincy.