† Citizen voting-age population estimated for prior cycles; 2004 predates the ACS and is extrapolated. Source: ACS 5-year, table B05003.
——
D+60R+60
20042024
Boundary by 2024 margin · Precinct returns · VEST · MIT Election Lab
People and households
Who lives here
Exact values for this place, its state, and the United States.
Race · ethnicity · ancestry
Communities and origins
GroupQuincyIllinoisUnited States
German32.8%16.1%12.5%
English10.0%6.9%9.5%
Irish9.6%10.6%9.4%
American5.4%3.3%5.3%
Italian2.0%5.4%4.8%
French1.6%0.7%1.6%
Scottish1.6%—1.3%
Swedish1.2%1.5%—
African American†3.5%12.1%9.9%
African0.5%0.5%0.5%
Mexican2.0%14.4%11.3%
Hispanic or Latino counts residents of any race; the race groups count only their non-Hispanic residents, so the groups are mutually exclusive and sum to 100%. Expand a row to see ancestries reported within that group.
Age and life stage
Measure
Quincy
Illinois
United States
Median age
39.7
39.1
39.1
Age 18–24
9.4%
9.1%
9.2%
Age 65 and older
20.3%
16.9%
17.2%
Household economy
Measure
Quincy
Illinois
United States
Median household income
$56,480
$83,390
$84,427
Poverty rate
16.7%
11.8%
12.5%
Bachelor's degree or higher (25+)
27.8%
37.9%
35.6%
Languages at home
Measure
Quincy
Illinois
United States
Speaks a non-English language at home
3.1%
24.1%
22.3%
Spanish
1.6%
14.0%
13.6%
Religious landscape
Measure
Quincy
Illinois
United States
Catholic
—
24.2%
18.6%
Evangelical Protestant
—
11.7%
16.5%
Unclaimed / not counted
—
49.2%
51.5%
American Community Survey 2024 5-year (CVAP, income, age, poverty, education, language, race, ancestry) · presidential returns from MIT Election Lab through 2024 · 2020 U.S. Religion Census (ASARB) — congregational adherents; unclaimed is the residual not counted by congregations.
Quincy, Illinois
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−23.5%
2008
−12.0%
2012
−24.0%
2016
−34.8%
2020
−31.8%
2024
−32.0%
DemocraticRepublican
6 presidential elections
Third column names the leading third-party or independent finisher. Source · MIT Election Lab · ICPSR · VEST (precinct-level 2024). Swing · margin change from the prior cycle. vs U.S. · margin relative to the national result that year. Third-party votes in 2012 are allocated from certified county totals by this place's share of each county's two-party vote — that cycle's precinct source records two-party splits. † 2004 sub-county results are estimated: the source's block-level detail for this cycle was unreliable — either county/municipality-level consolidated reporting (COVID-era) or a precinct-to-block allocation that misplaced votes — so the figures are allocated from the constituent county totals in proportion to the place and scaled to certified totals.
Year
Won
Democratic
Republican
Other
Margin
Swing
vs U.S.
Total
R
32.8%Harris5,661
64.8%Trump11,176
2.3%
R+32.0
R+0.2
R+30.5
17,242
R
33.0%Biden6,116
64.7%Trump12,010
2.3%
R+31.8
D+3.1
R+36.2
18,561
R
29.9%Clinton5,333
64.7%Trump11,549
5.4%
R+34.8
R+10.8
R+36.9
17,841
R
37.0%Obama6,380
61.0%Romney10,526
2.1%
R+24.0
R+12.0
R+27.9
17,262
R
43.3%Obama7,591
55.3%McCain9,690
1.3%
R+12.0
D+11.5
R+19.3
17,515
R
37.9%Kerry6,701
61.4%Bush10,843
0.7%
R+23.5
—
R+21.0
17,662
Quincy anchors Adams County on the Illinois-Missouri border and has trended increasingly Republican in presidential races since 2000, even as its mid-sized manufacturing and healthcare economy keeps it demographically distinct from surrounding rural townships.
Across the recorded series it reached a Republican high of 34.8 points in 2016. The 2024 margin was 32.0 points.
A population of 39,109, a 86% non-Hispanic-white share, and a median household income of $56,480 describe the city. The city's voting pattern over the last decade is most similar to that of Troy and Findlay.
Akashic
Political twins — cities
The cities whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
In 2024, Quincy, Illinois voted Republican by 32.0 points (R+32.0), carried by the Republican candidate. Out of 17,242 votes cast, 5,661 went Democratic and 11,176 went Republican.
How many people live in Quincy, Illinois?
Quincy, Illinois has a population of 39,109 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Quincy, Illinois?
Median household income in Quincy, Illinois is $56,480 — below the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Quincy, Illinois?
Akashic tracks 6 presidential elections in Quincy, Illinois from 2004 to 2024. Of those, 0 went Democratic and 6 went Republican.
