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.

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

White

Two or more races

Black or African American

Asian

Other race

Native American

Native Hawaiian or Pacific Islander

Race	Population	Percentage (of total)
White	34,181	87.22%
Two or more races	2,278	5.81%
Black or African American	2,045	5.22%
Asian	404	1.03%
Other race	264	0.67%
Native American	14	0.04%
Native Hawaiian or Pacific Islander	2	0.01%

Quincy Marital Status

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