† 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
GroupRochesterIllinoisUnited States
German24.7%16.1%12.5%
English14.9%6.9%9.5%
Irish14.8%10.6%9.4%
American6.0%3.3%5.3%
Italian5.4%5.4%4.8%
Polish2.4%6.0%2.2%
Scottish2.3%—1.3%
French2.1%0.7%1.6%
Asian Indian0.7%2.1%1.4%
Filipino0.5%1.0%0.9%
Chinese0.3%1.0%1.3%
Mexican0.4%14.4%11.3%
Puerto Rican0.2%1.7%1.8%
Honduran0.1%0.2%0.3%
Colombian0.1%0.3%0.4%
African American†1.4%12.1%9.9%
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
Rochester
Illinois
United States
Median age
39.8
39.1
39.1
Age 18–24
7.7%
9.1%
9.2%
Age 65 and older
19.2%
16.9%
17.2%
Household economy
Measure
Rochester
Illinois
United States
Median household income
$117,118
$83,390
$84,427
Poverty rate
2.5%
11.8%
12.5%
Bachelor's degree or higher (25+)
47.9%
37.9%
35.6%
Languages at home
Measure
Rochester
Illinois
United States
Speaks a non-English language at home
0.0%
24.1%
22.3%
Religious landscape
Measure
Rochester
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.
Rochester, Illinois
presidential history
Presidential margin, 2004–2024
Democratic minus Republican, by election
Presidential margin over time
Year
Margin (D minus R)
2004
−34.4%
2008
−12.6%
2012
−29.3%
2016
−24.2%
2020
−17.1%
2024
−19.3%
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
38.7%Harris937
58.0%Trump1,404
3.3%
R+19.3
R+2.2
R+17.8
2,421
R
40.3%Biden1,018
57.3%Trump1,450
2.4%
R+17.1
D+7.1
R+21.5
2,529
R
33.1%Clinton739
57.3%Trump1,280
9.7%
R+24.2
D+5.1
R+26.3
2,235
R
34.3%Obama676
63.6%Romney1,253
2.1%
R+29.3
R+16.7
R+33.1
1,970
R
42.8%Obama963
55.4%McCain1,247
1.9%
R+12.6
D+21.8
R+19.9
2,252
R
32.7%Kerry725
67.1%Bush1,488
0.3%
R+34.4
—
R+31.9
2,219
Rochester Village sits just southeast of the state capital, drawing households tied to state government employment. Its small but stable population makes it a readable bellwether for Sangamon County's suburban voting patterns.
Across the recorded series it reached a Republican high of 34.4 points in 2004. Between 2020 and 2024 the city moved 2.2 points toward the Republican candidate; the 2024 margin was 19.3 points.
A population of 3,766, a 93% non-Hispanic-white share, and a median household income of $117,118 describe the city.
In 2024, Rochester, Illinois voted Republican by 19.3 points (R+19.3), carried by the Republican candidate. Out of 2,421 votes cast, 937 went Democratic and 1,404 went Republican.
How many people live in Rochester, Illinois?
Rochester, Illinois has a population of 3,766 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Rochester, Illinois?
Median household income in Rochester, Illinois is $117,118 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Rochester, Illinois?
Akashic tracks 6 presidential elections in Rochester, Illinois from 2004 to 2024. Of those, 0 went Democratic and 6 went Republican.
