Quincy demographics profile

StatisticQuincyIllinoisNational
Population40,68912,851,684318,558,162
Population density (sq mi)2,56422291
Median age39.937.437.7
Male/Female ratio0.9:11.0:11.0:1
Married (15yrs & older)57%55%55%
Families w/ Kids under 1844%44%43%
Speak English98%77%79%
Speak Spanish1%13%13%
Quincy, IL has a population of 40,689 and is the 1,014th largest city in the United States. The population density is 2,564 per sq mi which is 1053% higher than the Illinois average and 2729% higher than the national average. The median age in Quincy is 40 which is approximately 7% higher than the Illinois average of 37. In Quincy, 57% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 76% of Quincy residents were born in Illinois, 22% were born out of state, 0% were born outside of the United States and 2% were foreign born.
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Did you know?

  • The population density in Quincy is 1053% higher than Illinois.
  • The median age in Quincy is 7% higher than Illinois.
  • In Quincy 89.98% of the population is White.
  • In Quincy 5.73% of the population is Black or African American.
  • In Quincy 1.04% of the population is Asian.

Compare Quincy, IL Demographics To Other Cities

Quincy population breakdown by race

RaceQuincyIllinoisNational
White89.98%72.14%73.35%
Black or African American5.73%14.30%12.63%
Asian1.04%5.10%5.22%
American Indian0.16%0.23%0.82%
Native Hawaiian0.13%0.03%0.18%
Mixed race2.03%2.34%3.06%
Other race0.93%5.86%4.75%
In Quincy, 1.7% of people are of Hispanic or Latino origin.
Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

Quincy age breakdown

Marital status

Age of children in married couples

Source: The Quincy, IL demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).
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