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Quincy

Illinoiscity

Photograph of Quincy
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Quincy

Total population

39,109

Median home value

$153,200

27.8%

Bachelor's+

Median income

$56,480

Quincy$56k
National$74k

Founded

1819

Air quality index

47Good
Elevation173 m
Land area41.2 km²
Weather71°F · Partly Cloudy
Coordinates39.93°, -91.38°

Demographic figures from US Census Bureau · ACS 5-year estimates. Overview below cites Wikipedia and may reference a different year.

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Active weather alerts
  • Extreme Heat Warning · Severe
    Extreme Heat Warning issued September 4 at 2:49PM CDT until September 5 at 8:00PM CDT by NWS St Louis MO

Source: NOAA National Weather Service.

City facts

Founded
1819
Elevation
173 m
Area
41.2 km²
Nickname
Gem City
Official website
www.quincyil.gov

Facts from Wikidata (CC0).

Overview

Quincy is a city in Adams County, Illinois, United States, and its county seat. Located on the Mississippi River, the population was 39,463 as of the 2020 census, down from 40,633 in 2010. The Quincy micropolitan area had 114,649 residents.

Read more on Wikipedia

History & geography

History

Quincy's location along the Mississippi River has attracted settlers for centuries. The French became the first European presence to colonize the region, after Louis Jolliet, Jacques Marquette, Jamison Knapp and the La Salle Expeditions explored the Upper Mississippi River Valley. Fur goods became a valuable commodity of the region, and European explorers and merchants alike were attracted to the prospects of the growing fur trade of the North American frontier. The Mississippi River, acting as a superhighway for transporting goods downstream, became the area's most vital transportation asset. Following the events of the Seven Years' War, which ended in 1763, Great Britain took control of New France, and the area that is now Illinois became part of the Indian Reserve. After the American Revolutionary War a few decades later, the area became part of the Northwest Territory of the United States, and eventually the State of Illinois in 1818. After the War of 1812, the American government granted military tracts to veterans as a means to help populate the West. Peter Flinn, having acquired the land from veteran Mark McGowan for his military service in 1819, ended up selling of land acquisitions to Moravia, New York native John Wood for $60 (~$ in ). John Wood later founded Quincy, which at the time was coined Bluffs, Illinois. In 1825, Bluffs renamed their community Quincy and became the seat of government for Adams County, both named after newly elected President John Quincy Adams. In addition, they originally named the town square John Square until eventually changing its name to Washington Square. In December 1830, Peter Felt, who had recently arrived with his family from New Hampshire, and others held the first service at what would become the first congregational…

Geography

Quincy is located at (39.932335, -91.388737). It is adjacent to the Mississippi River and Quincy Bay, a large inlet of water fed by Cedar and Homan Creeks. According to the 2021 census gazetteer files, Quincy has a total area of , of which (or 99.73%) is land and (or 0.27%) is water. The city is situated on bluffs overlooking the Mississippi River. Adjacent to Quincy, on the Missouri side of the river, is West Quincy, Missouri and a vast floodplain used primarily for farming. East of Quincy lies the Quincy Hills geographic region, a region of hills that are similar to the Lincoln Hills in Missouri, where a mixture of rolling hills, woods, and farming shape the landscape. Flat prairie lie north of Quincy and as the Mississippi turns sharply to the southwest; bluffs, floodplain, and farmland lie to the south and southwest of the city. The Quincy micropolitan area includes Adams County, Illinois and Lewis County, Missouri and together hold a population of 75,546. Due to its proximity to Hannibal, Missouri, the two communities have been bulked into Quincy-Hannibal, IL-MO Combined Statistical Area which holds approximately 116,000 residents. As of the 2010 Census, it is currently ranked as the 156th most populated CSA in the United States. Geographically, Quincy is the largest city and central hub of the tri-state area encompassing western Illinois, northeastern Missouri, and southeastern Iowa. Quincy has several suburbs. North Quincy is the city's most populated suburb and lies to the north, beyond a rail line and a large creek. Hickory Grove, Illinois is an edge town and lies adjacent to Quincy to its east, bordered by Interstate 172. The town of Marblehead lies to the south, and West Quincy to the west. The Hannibal–Quincy micropolitan area is also technically…

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Excerpted from the corresponding Wikipedia article (CC BY-SA).

Demographics & economy

Median age
39.7
Median home value
$153,200
Housing units
19,139
Poverty rate
16.7%
Unemployment
4.7%

Race & ethnicity

White
86.7%
Black
4.2%
Asian
1%
Hispanic
2.5%

Source: US Census Bureau — American Community Survey, 5-year estimates.

Geography

Latitude
39.9337
Longitude
-91.3793
Water area
0.04 mi²
View on OpenStreetMap

Coordinates & boundaries from the US Census TIGER/Line shapefiles.

Climate

Current forecast

Overnight
71°F
Partly Cloudy
Thursday
90°F
Mostly Sunny
Thursday Night
71°F
Partly Cloudy
Friday
89°F
Chance Showers And Thunderstorms
Friday Night
73°F
Partly Cloudy
Saturday
91°F
Partly Sunny

Forecast for Quincy, IL from NOAA NWS API.

Air quality

US AQI — Good
47
PM2.5 (µg/m³)
5.6
PM10 (µg/m³)
6.6
Ozone (µg/m³)
75
NO₂ (µg/m³)
5.8

Current readings from Open-Meteo Air Quality API (Copernicus CAMS European reanalysis).

Industrial & pollution facilities

Natural hazard risk

Health (adults)

High blood pressure
32.9%
Diabetes
10.5%
Adult obesity
39.5%
Binge drinking
20%
Adult smoking
16.6%
No leisure activity
24.5%

Age-adjusted prevalence estimates from CDC PLACES (latest release).

Walkability

Amenities nearby

Wildlife & biodiversity

Observations (last 5 yrs, 10 mi)
50,008
Distinct species (top 10)
10

Most-observed species

  • Northern Cardinal
    Cardinalis cardinalis (Linnaeus, 1758) · Aves
    2,064
  • House Sparrow
    Passer domesticus (Linnaeus, 1758) · Aves
    1,708
  • Mourning Dove
    Zenaida macroura (Linnaeus, 1758) · Aves
    1,630
  • American Robin
    Turdus migratorius Linnaeus, 1766 · Aves
    1,483
  • European Starling
    Sturnus vulgaris Linnaeus, 1758 · Aves
    1,457
  • Red-bellied Woodpecker
    Melanerpes carolinus (Linnaeus, 1758) · Aves
    1,363
  • Downy Woodpecker
    Dryobates pubescens (Linnaeus, 1766) · Aves
    1,336
  • Blue Jay
    Cyanocitta cristata (Linnaeus, 1758) · Aves
    1,231

Citizen-science & research observations from the Global Biodiversity Information Facility (GBIF).

Schools

Earthquake history

Quakes ≥ 2.5 (25 yrs, 62 mi)
2
Largest magnitude
2.9
Largest event
2004-02-08

Most recent

Events from the USGS Earthquake Catalog (global) (FDSN Event Web Service).

Photos

Sights & places nearby

Notable people from here

People born within ~10 km, from Wikidata (CC0). Click any name for their Wikipedia article.

Nearby places in Illinois

Browse all places in Illinois →

Geography & sun

Avg solar (kWh/m²/day)
4.16
Annual solar (kWh/m²)
1,520

Elevation, sunrise/sunset and daylight from Open-Meteo. Solar climatology from NASA POWER.

Nearby airports

Public attention

Wikipedia views (last 30 days)
5,996
Avg daily Wikipedia views
200
Attention level
Quiet

Pageview totals from the Wikimedia Pageviews API.

Books about Quincy

Search results from Open Library.

Recent natural events nearby

Ground air-quality sensors

Recently spotted species

Research-grade observations from iNaturalist (within ~15 mi).

Nearest stream gauge

Site
South Fabius River near Taylor, MO
Distance
10.9 mi
Streamflow
12.2 cfs
Gage height
1.4 ft

Live readings from USGS NWIS · measured 2026-09-04 20:30 UTC.

Events

Sources

  • • Wikipedia
  • • US Census Bureau (ACS 5-year estimates)
  • • NOAA National Weather Service
  • • Wikidata
  • • Open-Meteo Air Quality (CAMS)
  • • USGS Earthquake Catalog (global feed)
  • • USGS NWIS (water data)
  • • GBIF (Global Biodiversity Information Facility)
  • • iNaturalist
  • • CDC PLACES
  • • Open-Meteo / sunrise-sunset.org
  • • Wikipedia Pageviews API
  • • Open Library