Quincy, IL Profile: Facts, Map & Data


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Quincy, Illinois - Basic Facts

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The City of Quincy had a population of 40,567 as of July 1, 2017. Quincy ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Illinois. See peer rankings below.

The primary coordinate point for Quincy is located at latitude 39.9337 and longitude -91.3793 in Adams County. The formal boundaries for the City of Quincy (see map below) encompass a land area of 15.87 sq. miles and a water area of 0.04 sq. miles. Adams County is in the Central time zone (GMT -6). The elevation is 568 feet.

The City of Quincy (GNIS ID: 2396301) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Quincy is located within Township of Quincy, a minor civil division (MCD) of Adams County.

Beneath the boundary map are tables with Quincy population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Quincy: Bluffs, Gem City.

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City of Quincy, IL Boundary Map

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Boundary Maps: Township of Quincy | Adams County | Illinois Counties

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Quincy, IL Data & Demographics (As of July 1, 2017)


Total Population 40,567
Daytime Population: Workers 26,927
Daytime Population: Residents 21,065
Total Daytime Population (TDP) 47,992
Ratio TDP/Total Population1 1.18
Population in Households 38,548
Population in Familes 28,820
Population in Group Qrtrs 2,019
Population Density2 2,556
Diversity Index3 23


Median Household Income $42,016
Average Household Income $58,307
Per Capita Income $24,989


Total Housing Units 18,885 (100%)
Owner Occupied HU 10,549 (55.9%)
Renter Occupied HU 6,542 (34.6%)
Vacant Housing Units 1,794 ( 9.5%)
Median Home Value $100,217
Average Home Value $128,548


Total Households 17,091
Average Household Size 2.26
Family Households 9,822
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -0.02% 0.04%
Households -0.05% 0.02%
Families -0.2% -0.13%
Median Household Income   1.19%
Per Capita Income   2.48%

Quincy, IL - Peer Comparisons by Rank and Percentile

The table below compares Quincy to the other 1,368 incorporated cities, towns and CDPs in Illinois by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 44 97th
Population Density # 174 87th
Diversity Index # 435 68th
Median Household Income # 1118 18th
Per Capita Income # 854 38th

Additional comparisons and rankings can be made with a VERY EASY TO USE Illinois Census Data Comparison Tool.

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