Quincy Flag

Quincy

County:
Adams County
County Seat:
Yes
Area (mi²):
15.767
State:
Illinois

Quincy is a city located in Adams County, Illinois. Quincy has a 2025 population of 38,398. It is also the county seat of Adams County. Quincy is currently declining at a rate of -0.52% annually and its population has decreased by -2.57% since the most recent census, which recorded a population of 39,410 in 2020.

The average household income in Quincy is $76,426 with a poverty rate of 15.43%.The median age in Quincy is 40.1 years: 38.5 years for males, and 41.3 years for females.

38.4K
Total Population
2,435
Density (mi²)
-202 -0.52%
Growth

Quincy Population

Quincy Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Quincy includes 87.22% White, 5.22% Black or African American, and smaller percentages for Asian, other race, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White34,18187.22%
Two or more races2,2785.81%
Black or African American2,0455.22%
Asian4041.03%
Other race2640.67%
Native American140.04%
Native Hawaiian or Pacific Islander20.01%

Quincy Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Quincy's average per capita income is $43,931. Household income levels show a median of $56,372. The poverty rate stands at 15.43%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$96,884-
Families$80,172$98,732
Households$56,372$76,426
Non Families$39,835$50,175

$43,931

Average Income

$56,372

Median Household Income

15.43%

Poverty Rate

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)