† 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
GroupWaterlooIllinoisUnited States
German40.4%16.1%12.5%
Irish13.1%10.6%9.4%
English10.3%6.9%9.5%
American5.2%3.3%5.3%
Italian4.0%5.4%4.8%
Polish3.4%6.0%2.2%
French3.1%0.7%1.6%
Swedish1.1%1.5%—
Mexican1.2%14.4%11.3%
Puerto Rican0.3%1.7%1.8%
Guatemalan0.2%0.3%0.5%
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
Waterloo
Illinois
United States
Median age
41.5
39.1
39.1
Age 18–24
7.3%
9.1%
9.2%
Age 65 and older
20.7%
16.9%
17.2%
Household economy
Measure
Waterloo
Illinois
United States
Median household income
$98,711
$83,390
$84,427
Poverty rate
5.9%
11.8%
12.5%
Bachelor's degree or higher (25+)
37.3%
37.9%
35.6%
Languages at home
Measure
Waterloo
Illinois
United States
Speaks a non-English language at home
2.6%
24.1%
22.3%
Spanish
1.4%
14.0%
13.6%
Religious landscape
Measure
Waterloo
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.
Waterloo, Illinois
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−12.7%
2008
−6.8%
2012
−20.6%
2016
−31.3%
2020
−30.2%
2024
−32.2%
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%Harris2,108
65.0%Trump4,173
2.2%
R+32.2
R+2.0
R+30.7
6,423
R
33.8%Biden2,197
64.0%Trump4,160
2.3%
R+30.2
D+1.1
R+34.6
6,504
R
31.1%Clinton1,839
62.4%Trump3,687
6.4%
R+31.3
R+10.7
R+33.4
5,907
R
38.6%Obama1,637
59.2%Romney2,512
2.2%
R+20.6
R+13.8
R+24.5
4,244
R
45.8%Obama2,475
52.6%McCain2,843
1.7%
R+6.8
D+5.9
R+14.1
5,409
R
43.5%Kerry2,099
56.2%Bush2,714
0.3%
R+12.7
—
R+10.3
4,828
Waterloo anchors Monroe County, one of Illinois's most reliably Republican counties, where German-heritage settlement patterns and rural-suburban demographics have produced consistent double-digit Republican margins in statewide races.
Across the recorded series it reached a Republican high of 32.2 points in 2024. Between 2020 and 2024 the city moved 2.0 points toward the Republican candidate; the 2024 margin was 32.2 points.
A population of 11,129, a 95% non-Hispanic-white share, and a median household income of $98,711 describe the city. The city's voting pattern over the last decade is most similar to that of Columbia and East Bethel.
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, Waterloo, Illinois voted Republican by 32.2 points (R+32.2), carried by the Republican candidate. Out of 6,423 votes cast, 2,108 went Democratic and 4,173 went Republican.
How many people live in Waterloo, Illinois?
Waterloo, Illinois has a population of 11,129 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Waterloo, Illinois?
Median household income in Waterloo, Illinois is $98,711 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Waterloo, Illinois?
Akashic tracks 6 presidential elections in Waterloo, Illinois from 2004 to 2024. Of those, 0 went Democratic and 6 went Republican.
