Grundy County, Illinois: Industrial Catholic Metro county. In 2024, voted R+30%. Republican peak: R+66 in 1920.
Key facts
- 2024 presidential margin
- R+30MIT Election Lab
- Political typology
- Industrial Catholic MetroAkashic typology
- Population
- 53,2192024 5-year
- Median household income
- $92,2352024 5-year
- White (non-Hispanic)
- 86.3%2024 5-year
- Black
- 2.3%2024 5-year
- Hispanic / Latino
- 12.0%2024 5-year
- Peak Democratic margin
- D+4 in 1996MIT Election Lab
- Peak Republican margin
- R+66 in 1920MIT Election Lab
- Most similar
- Oceana County, MI · similarity 0.99
2024 results by precinct
2024 precinct map of Grundy CountyPrecinct-level 2024 presidential results for Grundy County, with each precinct boundary colored by Democratic-vs-Republican margin.
—
Margin—
Turnout—
Harris +50Trump +50
Real precinct boundaries. Hover for vote totals.
presidential history
Presidential margin, 1876–2024
Democratic minus Republican, by election
| Year | Margin (D minus R) |
|---|---|
| 1876 | No data |
| 1880 | No data |
| 1884 | No data |
| 1888 | No data |
| 1892 | −6.2% |
| 1896 | −21.5% |
| 1900 | −35.9% |
| 1904 | −52.7% |
| 1908 | −35.7% |
| 1912 | −4.4% |
| 1916 | −35.5% |
| 1920 | −66.2% |
| 1924 | −53.0% |
| 1928 | −23.4% |
| 1932 | +2.8% |
| 1936 | −8.6% |
| 1940 | −23.2% |
| 1944 | −28.0% |
| 1948 | −29.2% |
| 1952 | −40.4% |
| 1956 | −48.9% |
| 1960 | −23.8% |
| 1964 | −2.6% |
| 1968 | −28.8% |
| 1972 | −41.7% |
| 1976 | −15.5% |
| 1980 | −33.5% |
| 1984 | −34.4% |
| 1988 | −22.4% |
| 1992 | −1.4% |
| 1996 | +3.9% |
| 2000 | −7.2% |
| 2004 | −13.8% |
| 2008 | +1.7% |
| 2012 | −8.9% |
| 2016 | −23.2% |
| 2020 | −25.8% |
| 2024 | −29.5% |
DemocraticRepublican
38 presidential elections
| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| R | 9,143 | 16,997 | 26,589 | ||
| R | 9,626 | 16,523 | 26,756 | ||
| R | 8,065 | 13,454 | 23,237 | ||
| R | 9,451 | 11,343 | 21,313 | ||
| D | 11,063 | 10,687 | 22,171 | ||
| R | 8,463 | 11,198 | 19,831 | ||
| R | 7,516 | 8,709 | 16,584 | ||
| D | 6,759 | 6,177 | 14,902 | ||
| R | 6,122 | 6,346 | 16,265 | ||
| R | 5,525 | 8,743 | 14,361 | ||
| R | 4,671 | 9,595 | 14,325 | ||
| R | 3,970 | 8,397 | 13,204 | ||
| R | 5,534 | 7,581 | 13,201 | ||
| R | 3,584 | 8,725 | 12,341 | ||
| R | 3,407 | 6,607 | 11,105 | ||
| R | 5,246 | 5,522 | 10,768 | ||
| R | 4,276 | 6,948 | 11,228 | ||
| R | 2,618 | 7,640 | 10,261 | ||
| R | 3,118 | 7,347 | 10,478 | ||
| R | 3,255 | 5,954 | 9,240 | ||
| R | 3,544 | 6,310 | 9,876 | ||
| R | 4,105 | 6,593 | 10,741 | ||
| R | 4,481 | 5,360 | 10,185 | ||
| D | 4,755 | 4,491 | 9,315 | ||
| R | 3,174 | 5,126 | 8,329 | ||
| R | 742 | 4,337 | 6,780 | ||
| R | 803 | 4,647 | 5,805 | ||
| R | 2,241 | 4,811 | 7,247 | ||
| O | 1,172 | 1,380 | 4,731 | ||
| R | 1,359 | 3,127 | 4,957 | ||
| R | 841 | 3,448 | 4,945 | ||
| R | 1,687 | 3,735 | 5,702 | ||
| R | 2,074 | 3,246 | 5,439 | ||
| R | 1,892 | 2,159 | 4,296 | ||
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Demographics
2024 ACS
Race, ethnicity, and ancestry
Click any group to see the ancestries typically reported within it.
German
21.4%
Irish
14.4%
Italian
10.3%
Polish
9.9%
English
9.2%
American
3.5%
French
1.9%
African American
1.8%
Multiple ancestry combinations reported; no single grouping above 1%.
Sample size too small to break out by ancestry reliably.
American Indian, Alaska Native, Native Hawaiian, and Pacific Islander combined.
Source · American Community Survey 5-year estimates, 2024 release. Hispanic/Latino is an ethnicity that overlaps the race categories, so these shares can total more than 100%. Ancestry is a self-reported, multiple-response item; ancestry percentages do not sum to the parent race percentage.
2024 ACS
Age distribution by sex
Median age: 38.3 in this county, 39.1 nationally
Male
Age
Female
85+
75–84
65–74
55–64
45–54
35–44
25–34
18–24
5–17
<5
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Median household income
Inflation-adjusted dollars
$92,235
Grundy County ranks in the top 10% of US counties.
Grundy County$92,235
Illinois$83,390
United States$80,734
Grundy County ranks in the top 10% of US counties by median household income.
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Poverty rate
All persons below federal poverty line
6.0%
Child poverty is below the national average.
Children under 188.1%
Working age (18–64)5.2%
Seniors (65+)6.2%
Source · American Community Survey 5-year estimates, 2024 release.
2024 ACS
Language at home
Population aged 5 and older
91.5%
speak English only
Spanish6.6%
Other Indo-European1.1%
Asian & Pacific Islander0.5%
Other languages0.2%
Source · ACS 5-year estimates, 2024.
2020 religion census
Religious adherents
Adherents per capita by tradition
Source · 2020 US Religion Census. Remaining 63.9% of residents not counted as adherents by any reporting body.
Grundy County, anchored by Morris along the Illinois River, shifted from a competitive industrial belt to an R+29.5 result in 2024—a trajectory that mirrors the broader realignment of working-class exurban counties across the Midwest.
Its margins are typically close. The Democratic margin reached four points in 1996; the Republican margin reached sixty-six points in 1920. Between 2020 and 2024 the county moved four points toward the Republican candidate; the 2024 margin was thirty points.
Its demographics sit near national norms: a 86% non-Hispanic-white share, a median household income of $92,235, and a 6% poverty rate. The county's voting pattern over the last decade is most similar to that of Oceana County and Mecosta County.
Most similar counties
Compare two places, side by side
Twelve curated comparisons line up election history, demographics, and the divergence story for two places at a glance. Browse all comparisons →
Cite this page
All citations released under CC BY 4.0. Attribution: Akashic Intelligence.
Grundy County, Illinois. Akashic. https://akashic.app/county/17063/. Accessed May 20, 2026. License: CC BY 4.0.
License: CC BY 4.0
More industrial catholic metro counties
Frequently asked questions
How did Grundy County, Illinois vote in 2024?
In 2024, Grundy County, Illinois voted Republican by 29.5 points (R+30), carried by the Republican candidate. Out of 26,589 votes cast, 9,143 went Democratic and 16,997 went Republican.
What is Grundy County, Illinois's political typology?
Akashic places Grundy County, Illinois in the "Industrial Catholic Metro" typology — Mid-size industrial metros with Catholic ethnic roots — among the most competitive, swing-prone ground in the country. The typology is a data-driven cluster built from vote share, vote swing, race and ethnicity, income, language spoken at home, religion, and ancestry. Across 38 elections in the dataset, the county has voted Democratic 3 times, Republican 30 times, and other 1 times.
When did Grundy County, Illinois last vote Democratic?
The most recent presidential election in which Grundy County, Illinois voted Democratic was 2008.
How many people live in Grundy County, Illinois?
Grundy County, Illinois has a population of 53,219 according to the 2024 American Community Survey 5-year estimates from the US Census Bureau.
What is the median household income in Grundy County, Illinois?
Median household income in Grundy County, Illinois is $92,235 — above the national median of $80,734. The Illinois state median is $83,390.
What is the political history of Grundy County, Illinois?
Akashic tracks 38 presidential elections in Grundy County, Illinois from 1876 to 2024. Of those, 3 went Democratic and 30 went Republican. The county's typology — "Industrial Catholic Metro" — captures where that record, its demographics, and its recent swing place it among American communities.