| County: | Kane County |
| State: | Illinois |
| Type: | County |
| Flag: | Flag of Kane County, Illinois.png |
| Seal: | Seal of Kane County.jpg |
| Founded Year: | 1836 |
| Founded Date: | January 16 |
| Seat Wl: | Geneva |
| Largest City Wl: | Aurora |
| Area Total Sq Mi: | 524 |
| Area Land Sq Mi: | 520 |
| Area Water Sq Mi: | 4.1 |
| Area Percentage: | 0.8 |
| Census Yr: | 2020 |
| Pop: | 516522 |
| Pop Est As Of: | 2023 |
| Population Est: | 514982 |
| Density Sq Mi: | auto |
| Time Zone: | Central |
| District: | 8th |
| District2: | 11th |
| District3: | 14th |
| Web: | countyofkane.org |
| Ex Image: | Fabyan Windmill-13.JPG |
| Ex Image Cap: | The Fabyan Windmill in Geneva is on the National Register of Historic Places in Kane County, Illinois. |
Kane County is a county in the U.S. state of Illinois. According to the 2020 census, it has a population of 516,522,[1] making it the fifth-most populous county in Illinois. Its county seat is Geneva,[2] and its largest city is Aurora. Kane County is one of the collar counties of the metropolitan statistical area designated "Chicago–Naperville–Elgin, IL–IN–WI" by the US census.
Kane County was formed out of LaSalle County in 1836. The county was named in honor of Elias Kane, a United States senator and the first secretary of state of Illinois.[3]
According to the U.S. Census Bureau, the county's area was, of which is land and (0.8%) is water. Its largest cities are along the Fox River.
In recent years, average temperatures in the county seat of Geneva have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1985 and a record high of was recorded in July 1936. The average monthly precipitation ranged from in February to in July.
Kane County has an extensive forest preserve program, with numerous nature preserves, historic sites, and trails.[4]
| White alone (NH) | 273,390 | 304,051 | style='background: #ffffe6; | 282,307 | 67.65% | 59.01% | style='background: #ffffe6; | 54.66% | |
| Black or African American alone (NH) | 22,477 | 27,819 | style='background: #ffffe6; | 26,239 | 5.56% | 5.40% | style='background: #ffffe6; | 5.08% | |
| Native American or Alaska Native alone (NH) | 536 | 591 | style='background: #ffffe6; | 514 | 0.13% | 0.11% | style='background: #ffffe6; | 0.10% | |
| Asian alone (NH) | 7,142 | 17,505 | style='background: #ffffe6; | 21,191 | 1.77% | 3.40% | style='background: #ffffe6; | 4.10% | |
| Pacific Islander alone (NH) | 57 | 130 | style='background: #ffffe6; | 115 | 0.01% | 0.03% | style='background: #ffffe6; | 0.02% | |
| Some Other Race alone (NH) | 338 | 522 | style='background: #ffffe6; | 1,521 | 0.08% | 0.10% | style='background: #ffffe6; | 0.29% | |
| Mixed Race or Multi-Racial (NH) | 4,255 | 6,261 | style='background: #ffffe6; | 15,040 | 1.05% | 1.22% | style='background: #ffffe6; | 2.91% | |
| Hispanic or Latino (any race) | 95,924 | 158,390 | style='background: #ffffe6; | 169,595 | 23.74% | 30.74% | style='background: #ffffe6; | 32.83% | |
| Total | 404,119 | 515,269 | style='background: #ffffe6; | 516,522 | 100.00% | 100.00% | style='background: #ffffe6; | 100.00% |
As of the 2010 census, there were 515,269 people, 170,479 households, and 128,323 families residing in the county.[8] The population density was . There were 182,047 housing units at an average density of .[9] The racial makeup of the county was 74.6% white, 5.7% black or African American, 3.5% Asian, 0.6% American Indian, 13.0% from other races, and 2.6% from two or more races. Those of Hispanic or Latino origin made up 30.7% of the population. In terms of ancestry, 24.3% were German, 13.0% were Irish, 7.9% were Polish, 7.4% were Italian, 7.1% were English, and 2.4% were American.
Of the 170,479 households, 42.3% had children under the age of 18 living with them, 59.2% were married couples living together, 11.0% had a female householder with no husband present, 24.7% were non-families, and 19.8% of all households were made up of individuals. The average household size was 2.98 and the average family size was 3.45. The median age was 34.5 years.
The median income for a household in the county was $67,767 and the median income for a family was $77,998. Males had a median income of $53,833 versus $39,206 for females. The per capita income for the county was $29,480. About 7.0% of families and 9.1% of the population were below the poverty line, including 13.5% of those under age 18 and 5.7% of those age 65 or over.[10]
There are several hospitals serving the county:
Kane county has an extensive county highway system that includes federal, state and county maintained routes. During the years that the county was represented by Dennis Hastert it received many federal earmarks for highway improvements to respond to population growth. In addition, the county has entered into an agreement with the Illinois State Toll Highway Authority to operate a limited access toll bridge on the Longmeadow Parkway that is not connected to any other tollway.
Kane County services are overseen by a 24 member Board which is elected every two years. The Board's chair is elected every four years. The Board sets the County's budget. Corrine Michelle Pierog is the current County Board Chair. There are currently 16 Democrats and 8 Republicans on the Board.
In addition to the Board chair, there are nine county officeholders elected countywide every four years. These positions are the Auditor, Circuit Clerk, County Clerk, Coroner, Recorder, Regional Office of Education Superintendent, Sheriff, State's Attorney, and Treasurer.
| Chair | Corinne Pierog | Batavia | ||
| 1 | Myrna Molina | Aurora | ||
| 2 | Dale Berman | North Aurora | ||
| 3 | Anita Lewis | Aurora | ||
| 4 | Mavis Bates | Aurora | ||
| 5 | Bill Lenert | Sugar Grove | ||
| 6 | Ron Ford | Aurora | ||
| 7 | Monica Silva | Aurora | ||
| 8 | Michelle Gumz | Aurora | ||
| 9 | Gary Daughtery | Gilberts | ||
| 10 | Bill Tarver | Batavia | ||
| 11 | Leslie Juby | Geneva | ||
| 12 | Bill Roth | St. Charles | ||
| 13 | Michael Linder | St. Charles | ||
| 14 | Mark Davoust | St. Charles | ||
| 15 | David Young | Elgin | ||
| 16 | Michael Kenyon | South Elgin | ||
| 17 | Deborah Allan | Elgin | ||
| 18 | Rick Williams | Geneva | ||
| 19 | Mohammad "Mo" Iqbal | Elgin | ||
| 20 | Cherryl Fritz Strathmann | Elgin | ||
| 21 | Clifford Surges | Gilberts | ||
| 22 | Verner (Vern) Tepe | Elgin | ||
| 23 | Chris Kious | Algonquin | ||
| 24 | Jarett Sanchez | Carpentersville |
| Kane County Clerk | John "Jack" A. Cunningham | Republican | 2026 | ||
| Sheriff | Ron Hain | Democratic | 2026 | ||
| Treasurer | Chris Lauzen | Republican | 2026 | ||
| Board Chair | Corinne M. Pierog | Democratic | 2024 | ||
| Circuit Clerk | Theresa Barreiro | Democratic | 2024 | ||
| Auditor | Penny Wegman | Democratic | 2024 | ||
| Coroner | L. Robert Russell | Republican | 2024 | ||
| Recorder | Sandy Wegman | Republican | 2024 | ||
| State's Attorney | Jamie Mosser | Democratic | 2024 |
Kane County is coterminous with the 16th Judicial Circuit. The 16th Judicial Circuit is divided into four subcircuits. The first subcircuit consists of the majority of Aurora Township. The second subcircuit consists of most of Elgin and Dundee townships. The fourth subcircuit consists the tri-cities area of Batavia, Geneva, and Saint Charles. The third subcircuit consists of all territory not included in the other three subcircuits, which corresponds to an area of roughly the western two thirds of the county.[14]
As one of the Yankee-settled and prosperous suburban "collar counties", Kane County was a stronghold of the Free Soil Party in its first few elections, being one of nine Illinois counties to give a plurality to Martin van Buren in 1848. Kane County then unsurprisingly became solidly Republican for the century and a half following that party's formation. It voted for the GOP presidential nominee in every election between 1856 and 2004 except that of 1912 when the Republican Party was mortally divided and Progressive candidate Theodore Roosevelt carried the county with a majority of the vote over conservative incumbent William Howard Taft.
The gradual shift of the GOP towards white Southern Evangelicals, however, has led the generally moderate electorate of Kane and the other "collar counties" to trend towards the Democratic Party. In 2008, Senator Barack Obama became the first Democrat to carry Kane County since Franklin Pierce in 1852, and the first ever to win an absolute majority of the county's vote (the previous two Democratic winners, Pierce and James K. Polk in 1844 had both gained only pluralities due to strong Free Soil votes). Obama won a plurality in 2012, and Hillary Clinton improved upon Obama's showing to become the second Democrat to win a majority in 2016. In 2020, Joe Biden had the best performance ever by a Democrat in the county, even besting Obama's 2008 victory.
Kane County is represented in the United States House of Representatives by Democrats Bill Foster (11th District), Raja Krishnamoorthi (8th District), and Lauren Underwood (14th District).[15]