Quincy, Illinois Population 2021

39,751
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Quincy is a city located in Adams County Illinois. It is also the county seat of Adams County. With a 2020 population of 39,751, it is the 42nd largest city in Illinois and the 991st largest city in the United States . Quincy is currently declining at a rate of -0.25% annually and its population has decreased by -2.17% since the most recent census, which recorded a population of 40,633 in 2010. Quincy reached it's highest population of 45,288 in 1970. Spanning over 16 miles, Quincy has a population density of 2,530 people per square mile.

The average household income in Quincy is $65,733 with a poverty rate of 15.16%. The median rental costs in recent years comes to $710 per month, and the median house value is $116,300. The median age in Quincy is 40.7 years, 39.2 years for males, and 42.1 years for females.

Quincy Demographics

According to the most recent ACS, the racial composition of Quincy was:

  • White: 89.99%
  • Black or African American: 6.42%
  • Two or more races: 2.29%
  • Asian: 0.83%
  • Other race: 0.25%
  • Native American: 0.23%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Quincy, Illinois is 39,751 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 40,048.The last official US Census in 2010 recorded the population at 40,633.

Quincy, Illinois Population 2021

2019 and 2020 population is estimated by projecting the raw 2018 numbers.

Year Population Growth Growth Rate
202174,709-251-0.34%
202074,960-251-0.33%
201975,211-251-0.33%
201875,462-547-0.72%
201776,009-538-0.71%
201676,547-426-0.56%
201576,973-92-0.12%
201477,065-45-0.06%
201377,110-148-0.19%
201277,258-173-0.22%
201177,431610.08%
201077,3700.00%

Quincy Metro Area Population by Year

Population by Race

Race Population Percentage
White36,24689.99%
Black or African American2,5856.42%
Two or More Races9242.29%
Asian3330.83%
Some Other Race990.25%
American Indian and Alaska Native920.23%
Native Hawaiian and Other Pacific Islander10.00%
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Quincy Population by Race

Quincy Population Pyramid $2021

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Quincy Median Age

40.7


Total

39.2


Male

42.1


Female

Quincy Adults

There are 31,572 adults, (8,414 of whom are seniors) in Quincy.

Quincy Age Dependency

73.9

Age Dependency Ratio

36.3

Old Age Dependency Ratio

37.6

Child Dependency Ratio

Quincy Sex Ratio

Female

21,290

52.86%

Male

18,990

47.14%

Quincy Population by Age

Quincy Renter vs Owner Occupied by Household Type

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Quincy Household Types

Type Owner Renter
Married86.5%13.5%
All64.3%35.7%
Female49.1%50.9%
Non Family46.7%53.3%
Male41.3%58.7%

64.3%

Rate of Home Ownership

Quincy Households and Families

Type Count Average Size Owned
All17,2542.2664.3
Married7,6112.9986.5
Non Family7,0461.1946.7
Female2,0642.9649.1
Male5333.3541.3

2.92

Average Family Size

2.26

Average Household Size

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Quincy Households by Type

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Education Attained Count Percentage
Less Than 9th Grade6802.43%
9th to 12th Grade1,6816.00%
High School Graduate9,85635.18%
Some College6,92124.71%
Associates Degree2,1937.83%
Bachelors Degree4,30815.38%
Graduate Degree2,3758.48%
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Quincy Educational Attainment by Sex (over 25)

Quincy Educational Attainment by Race

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Race Total High School Bachelors
White25,59623,7656,225
Black1,5781,157118
Hispanic394369151
2+ Races22017986
Asian180180127
Native American9243
Other Race322619

The highest rate of high school graduation is among asian people with a rate of 100.00%.

The highest rate of bachelors degrees is among asian people with a rate of 70.56%.

Quincy Educational Attainment by Race

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Name Average Male Female
Overall$35,754$41,333$29,404
Less Than 9th Grade$21,250$25,556$
High School Graduate$31,542$38,102$25,423
Some College$32,290$41,382$24,840
Bachelors Degree$40,873$42,665$36,426
Graduate Degree$54,030$75,040$47,063

$35,754

Average Earnings

$41,333

Average Male

$29,404

Average Female

Quincy Earnings by Educational Attainment

Quincy Language by Age

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Quincy Language

98.14% of Quincy residents speak only English, while 1.86% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 0.70% of the population.

Quincy Language

Quincy Poverty by Race

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Name Total In Poverty Poverty Rate
White34,6854,51013.00%
Black2,37592839.07%
Multiple90333436.99%
Hispanic6467411.46%
Asian3234413.62%
Native921920.65%
Other891011.24%

15.16%

Overall Poverty Rate

12.83%

Male Poverty Rate

17.25%

Female Poverty Rate

Poverty in Quincy

The race most likely to be in poverty in Quincy is Black, with 39.07% below the poverty level.

The race least likely to be in poverty in Quincy is Other, with 11.24% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 3.55%. Among those working part-time, it was 16.91%, and for those that did not work, the poverty rate was 23.39%.

Quincy Poverty

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Name Poverty
Less Than 9th Grade25.49%
High School13.22%
Some College12.45%
Bachelors or Greater4.53%

Quincy Poverty Rate by Education

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Rate Poverty
Male Unemployed43.85%
Female Unemployed39.79%
Female Employed9.61%
Male Employed4.28%

Quincy Poverty Rate by Employment Status and Sex

Quincy Income by Household Type

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Name Median Mean
Households$46,189$65,733
Families$62,370$80,103
Married Families$75,890-
Non Families$30,935$42,880
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Income by Household Type

Quincy Marital Status

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Marriage Rates

48.9%

Overall Marriage Rate

53.4%

Male Marriage Rate

45.0%

Female Marriage Rate

Quincy Married by Age and Sex

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Quincy Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 45-54.

Quincy Marital Status by Race

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Quincy Marital Status

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2,718

Number of Veterans

2,526

Male Veterans

192

Female Veterans

War Veterans
Vietnam835
Second Gulf War438
First Gulf War430
Korea249
World War II124

Quincy Veterans by War

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Age Group Veterans
75+808
65 to 74744
35 to 54569
55 to 64307
18 to 34290

Quincy Veterans by Age

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Name Veterans % of Total
White2,6629.15%
Hispanic428.86%
Black392.20%
Native American99.78%
Asian83.83%

Quincy Veterans by Race

Quincy Veterans by Education

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6.41%

Veteran Poverty Rate

29.07%

Veteran Disability Rate

Quincy Veterans by Education

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63.5%

Labor Force Participation

60.1%

Employment Rate

5.3%

Unemployment Rate

Quincy Employment by Age

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Quincy Employment by Race

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Quincy Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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75.25%

Born in Quincy

98.62%

Native Born

1.38%

Foreign Born

0.37%

Non Citizen

1.01%

Naturalized

Place of Birth

98.62% of Quincy residents were born in the United States, with 75.25% having been born in Illinois. 0.37% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Quincy Place of Birth

Year Population Growth Annual Growth Rate
202139,751-99-0.25%
202039,850-99-0.25%
201939,949-99-0.25%
201840,048-222-0.55%
201740,270-221-0.55%
201640,491-200-0.49%
201540,691-48-0.12%
201440,739-32-0.08%
201340,771-57-0.14%
201240,828-66-0.16%
201140,8941330.33%
201040,7613950.10%
200040,3666850.17%
199039,681-2,873-0.70%
198042,554-2,734-0.62%
197045,2881,4950.34%
196043,7932,3430.55%
195041,4509810.24%
194040,4691,2280.31%
193039,2413,2630.87%
192035,978-609-0.17%
191036,5873350.09%
190036,2524,7581.42%
189031,4944,2261.45%
188027,2683,2161.26%
187024,05210,3345.78%
186013,7186,8167.11%
18506,9020.00%

Quincy Population by Year