# DeKalb County, Illinois

DeKalb County is a county located in the U.S. state of Illinois. As of the 2020 United States census, the population was 100,420. Its county seat is Sycamore. DeKalb County is part of the Chicago–Naperville–Elgin, IL–IN–WI Metropolitan Statistical Area.

## History

DeKalb County was formed on March 4, 1837, out of Kane County, Illinois. The county was named for Johann de Kalb, a German (Bavarian) hero of the American Revolutionary War. DeKalb County's area is approximately 632.7 square miles, and it is located 63 miles west of Chicago. There are 19 townships in the county; the county seat is Sycamore.
Between 1834 and 1837, after the Potawatomi people had been pushed out, European Americans formed settlements in DeKalb County along streams and wooded areas due to fertile soil, wild game, and food and water opportunities. Primary growth stemmed from the introduction of the railroad, which brought easier methods of transportation and opportunities for industrial growth. Early industries based in DeKalb County included Sandwich Mfg. Co, Marsh Harvester Co, barbed wire, and Gurler Bros Pure Milk Co.
The county is noted for agriculture. In 1852, the DeKalb Agricultural Society produced the county's first Agricultural Fair, in Sycamore. Eventually farmers, businessmen, bankers and newspapermen organized to become the DeKalb County Soil Improvement Association, which later was split into DeKalb County Farm Bureau and DeKalb Agricultural Association (DEKALB AgResearch, Inc., Monsanto). DeKalb County is credited with being the birthplace of the Farm Bureau movement. DeKalb County is the 2nd largest hog producing county in Illinois and the 66th largest in the nation.
Education has played an important role in the area: Northern Illinois University is located in DeKalb and Kishwaukee College is located in Malta. Except for 2020 (due to the COVID-19 pandemic), a major fair has been held each year since 1887 at the Sandwich Fairgrounds in Sandwich.
* DeKalb County at the time of its creation in 1837

## Pronunciation

Unlike similarly spelled locations, such as DeKalb County, Georgia, DeKalb denizens from Illinois pronounce the county name /dɪˈkælb/ di-KALB, with an L sound, as in German, after its namesake.

## Geography

According to the US Census Bureau, the county has a total area of 635 square miles (1,640 km$^2$), of which 631 square miles (1,630 km$^2$) is land and 3.4 square miles (8.8 km$^2$) (0.5%) is water.

### Climate and weather

In recent years, average temperatures in the county seat of Sycamore have ranged from a low of 10 °F (−12 °C) in January to a high of 84 °F (29 °C) in July, although a record low of −27 °F (−33 °C) was recorded in January 1985 and a record high of 103 °F (39 °C) was recorded in August 1988. Average monthly precipitation ranged from 1.40 inches (36 mm) in February to 4.49 inches (114 mm) in June.

### Adjacent counties

* Boone County - north
* McHenry County - northeast
* Kane County - east
* Kendall County - southeast
* LaSalle County - south
* Lee County - west
* Ogle County - west
* Winnebago County - northwest

### Major highways

* Interstate 88
* US Route 30
* US Route 34
* Illinois Route 23
* Illinois Route 38
* Illinois Route 64
* Illinois Route 72
* Illinois Route 110

### Transit

* DeKalb Public Transit

## Demographics

DeKalb County, Illinois – Racial and ethnic composition Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race. :
| Race / Ethnicity (NH = Non-Hispanic) | Pop 2000 | Pop 2010 | Pop 2020 | % 2000 | % 2010 | % 2020 |
| White alone (NH) | 75,772 | 83,825 | 71,249 | 85.17% | 79.71% | 70.95% |
| Black or African American alone (NH) | 4,040 | 6,579 | 8,730 | 4.54% | 6.26% | 8.69% |
| Native American or Alaska Native alone (NH) | 146 | 127 | 119 | 0.16% | 0.12% | 0.12% |
| Asian alone (NH) | 2,067 | 2,400 | 2,280 | 2.32% | 2.28% | 2.27% |
| Native Hawaiian or Pacific Islander alone (NH) | 40 | 19 | 29 | 0.04% | 0.02% | 0.03% |
| Other race alone (NH) | 92 | 114 | 298 | 0.10% | 0.11% | 0.30% |
| Mixed race or Multiracial (NH) | 982 | 1,449 | 4,118 | 1.10% | 1.38% | 4.10% |
| Hispanic or Latino (any race) | 5,830 | 10,647 | 13,597 | 6.55% | 10.12% | 13.54% |
| Total | 88,969 | 105,160 | 100,420 | 100.00% | 100.00% | 100.00% |
As of the 2010 United States census, there were 105,160 people, 38,484 households, and 23,781 families residing in the county. The population density was 166.6 inhabitants per square mile (64.3/km$^2$). There were 41,079 housing units at an average density of 65.1 per square mile (25.1/km$^2$). The racial makeup of the county was 85.1% white, 6.4% black or African American, 2.3% Asian, 0.3% American Indian, 3.9% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 10.1% of the population. In terms of ancestry, 32.6% were German, 17.5% were Irish, 8.7% were English, 7.0% were Polish, 6.4% were Italian, 6.3% were Swedish, and 4.7% were Norwegian.
Of the 38,484 households, 31.9% had children under the age of 18 living with them, 47.2% were married couples living together, 10.2% had a female householder with no husband present, 38.2% were non-families, and 25.8% of all households were made up of individuals. The average household size was 2.56 and the average family size was 3.11. The median age was 29.3 years.
The median income for a household in the county was $54,002 and the median income for a family was $70,713. Males had a median income of $50,192 versus $35,246 for females. The per capita income for the county was $24,179. About 7.7% of families and 14.6% of the population were below the poverty line, including 13.2% of those under age 18 and 4.5% of those age 65 or over.

## Communities
### Cities

* DeKalb
* Genoa
* Sandwich (mostly)
* Sycamore

### Town

* Cortland

### Villages

* Hinckley
* Kingston
* Kirkland
* Lee (part)
* Malta
* Maple Park (part)
* Shabbona
* Somonauk (mostly)
* Waterman

### Unincorporated communities

* Afton Center
* Charter Grove
* Clare
* Colvin Park
* East Paw Paw
* Elva
* Esmond
* Fairdale
* Five Points
* Franks
* McGirr
* New Lebanon
* Rollo
* Shabbona Grove
* Wilkinson

### Townships

* Afton
* Clinton
* Cortland
* DeKalb
* Franklin
* Genoa
* Kingston
* Malta
* Mayfield
* Milan
* Paw Paw
* Pierce
* Sandwich
* Shabbona
* Somonauk
* South Grove
* Squaw Grove
* Sycamore
* Victor

## Politics

United States presidential election results for DeKalb County, Illinois :
| Year | Republican | Republican | Democratic | Democratic | Third party(ies) | Third party(ies) |
| Year | No. | % | No. | % | No. | % |
| 2024 | 22,716 | 47.75% | 23,648 | 49.71% | 1,206 | 2.54% |
| 2020 | 21,905 | 45.65% | 24,643 | 51.35% | 1,441 | 3.00% |
| 2016 | 19,091 | 43.79% | 20,466 | 46.94% | 4,043 | 9.27% |
| 2012 | 18,934 | 45.91% | 21,207 | 51.42% | 1,100 | 2.67% |
| 2008 | 18,266 | 40.61% | 25,784 | 57.33% | 924 | 2.05% |
| 2004 | 21,095 | 51.74% | 19,263 | 47.25% | 410 | 1.01% |
| 2000 | 17,139 | 51.57% | 14,798 | 44.53% | 1,296 | 3.90% |
| 1996 | 12,380 | 43.40% | 12,715 | 44.57% | 3,432 | 12.03% |
| 1992 | 12,655 | 36.97% | 13,744 | 40.15% | 7,833 | 22.88% |
| 1988 | 17,182 | 58.86% | 11,811 | 40.46% | 197 | 0.67% |
| 1984 | 20,294 | 64.50% | 10,942 | 34.78% | 229 | 0.73% |
| 1980 | 16,370 | 53.91% | 8,913 | 29.35% | 5,082 | 16.74% |
| 1976 | 18,193 | 59.21% | 11,535 | 37.54% | 1,000 | 3.25% |
| 1972 | 18,910 | 60.25% | 12,375 | 39.43% | 99 | 0.32% |
| 1968 | 14,535 | 63.20% | 6,974 | 30.32% | 1,490 | 6.48% |
| 1964 | 11,791 | 53.48% | 10,257 | 46.52% | 1 | 0.00% |
| 1960 | 15,586 | 69.62% | 6,783 | 30.30% | 19 | 0.08% |
| 1956 | 15,078 | 75.66% | 4,826 | 24.22% | 25 | 0.13% |
| 1952 | 14,807 | 74.23% | 5,110 | 25.62% | 30 | 0.15% |
| 1948 | 11,380 | 68.69% | 5,082 | 30.68% | 105 | 0.63% |
| 1944 | 12,157 | 66.76% | 6,004 | 32.97% | 49 | 0.27% |
| 1940 | 12,577 | 63.95% | 6,989 | 35.53% | 102 | 0.52% |
| 1936 | 9,826 | 53.77% | 7,899 | 43.22% | 550 | 3.01% |
| 1932 | 9,356 | 56.38% | 6,923 | 41.72% | 315 | 1.90% |
| 1928 | 11,501 | 74.19% | 3,940 | 25.41% | 62 | 0.40% |
| 1924 | 10,500 | 76.40% | 1,540 | 11.20% | 1,704 | 12.40% |
| 1920 | 10,374 | 83.93% | 1,700 | 13.75% | 287 | 2.32% |
| 1916 | 9,764 | 71.29% | 3,386 | 24.72% | 547 | 3.99% |
| 1912 | 1,776 | 24.28% | 1,568 | 21.44% | 3,970 | 54.28% |
| 1908 | 5,866 | 72.50% | 1,732 | 21.41% | 493 | 6.09% |
| 1904 | 5,957 | 77.43% | 1,137 | 14.78% | 599 | 7.79% |
| 1900 | 5,923 | 73.03% | 1,881 | 23.19% | 306 | 3.77% |
| 1896 | 5,598 | 72.38% | 1,881 | 24.32% | 255 | 3.30% |
| 1892 | 3,789 | 60.72% | 1,926 | 30.87% | 525 | 8.41% |
As part of Northern Illinois, DeKalb County was a stronghold for the Free Soil Party in its early elections – being among nine Illinois counties to support Martin Van Buren in 1848 – and became overwhelmingly Republican for the century following that party's formation. The only time it did not back the official GOP nominee between 1856 and 1988 was in 1912 when the Republican Party was mortally divided and Progressive Theodore Roosevelt won almost half the county's vote.
During this time, it rejected Democrats even in statewide and national landslides. In 1936, Republican nominee Alf Landon won DeKalb County by double digits while losing 46 of 48 states. Landon held Franklin D. Roosevelt to only 43 percent of DeKalb County's vote, the most he would garner in the county during his four runs for president. Even Barry Goldwater – renowned for his antagonism towards the establishment – won by seven percent in 1964, despite losing sixteen percent of the vote compared to Richard Nixon in 1960.
In 1992, with the third-party entrance of Ross Perot siphoning votes from Republican George H. W. Bush, Bill Clinton became the first Democrat to carry the county in 140 years. Clinton would narrowly win the county again in 1996, carrying the county by 335 votes over Republican nominee Bob Dole. Since then, DeKalb County has become more of a swing county in national elections, owing to the growth of the largely Democratic student population in DeKalb. However, it has bucked the Democratic trend seen in most counties dominated by college towns. Republicans still hold most county-level elected offices, and all municipalities outside of the city of DeKalb are still powerfully Republican. Even still, 2004 marked the last time a Republican presidential candidate carried the county.
In 2008, an Illinois son, Barack Obama, became the first Democrat to win DeKalb County with a majority since Van Buren in the county's first-ever presidential election, in 1840. Obama repeated this in 2012, but gains for third-party candidates caused both major-party candidates to underperform in 2016, though the county was still won by Democrat Hillary Clinton. 2016 marked the first time the county had voted Democratic in three consecutive presidential elections since the establishment of the Republican Party. In 2020, Joe Biden became the first Democrat who was not an Illinois native to win a majority of the vote in DeKalb since 1840 — Biden had served eight years as Obama's Vice President.

## Education
### Tertiary

Northern Illinois University is in the county.

### K-12

The following school districts have territory in the county, no matter how slight, even if their schools and/or administrative headquarters are in other counties:
K-12:
* Belvidere Consolidated Unit School District 100
* Central Community Unit School District 301
* Community Unit School District 300
* DeKalb Community Unit School District 428
* Earlville Community Unit School District 9
* Genoa-Kingston Community Unit School District 424
* Hinckley-Big Rock Community Unit School District 429
* Hiawatha Community Unit School District 426
* Indian Creek Community Unit District 425
* Kaneland Community Unit School District 302
* Lee Center Community Unit School District 271
* Leland Community Unit School District 1
* Sandwich Community Unit School District 430
* Somonauk Community Unit School District 432
* Sycamore Community Unit School District 427
Secondary:
* Rochelle Township High School District 212
Elementary:
* Creston Community Consolidated School District 161
* Eswood Community Consolidated District 269
* Steward Elementary School District 220