Lake County, Illinois

Lake County, Illinois
County	Lake County
State	Illinois
Founded	March 1, 1839
Seat	Waukegan
Largest city	Waukegan
Area total sq mi	1,368
Area land sq mi	444
Area water sq mi	924
Population as of	2020
Population total	714,342
Population density sq mi	1609
Time zone	Central
Named for	Lake Michigan
Ex image cap	The Lake County Courthouse in Waukegan

Lake County, Illinois is a populous and economically significant county located in the northeastern corner of the state, along the shores of Lake Michigan. It is part of the Chicago metropolitan area and is bordered by Wisconsin to the north, McHenry County to the west, and Cook County to the south. The county seat is Waukegan, its largest city, and it is home to numerous affluent suburbs, corporate headquarters, and natural preserves, making it a region of considerable diversity and influence.

History

The area was originally inhabited by the Potawatomi people, with early European exploration and trade conducted by French voyageurs like Jacques Marquette. Following the Treaty of Chicago in 1833, which forced the removal of Native American tribes, American settlers began arriving in greater numbers. It was officially formed from part of McHenry County on March 1, 1839, and named for its defining feature, Lake Michigan. The arrival of the Chicago and North Western Railway spurred the growth of communities like Waukegan and Libertyville, transforming the region from agricultural land into industrial and suburban centers. During the American Civil War, the county contributed troops to the Union Army, including members of the 96th Illinois Volunteer Infantry Regiment.

Geography

According to the U.S. Census Bureau, the county has a total area of 1,368 square miles, of which 444 square miles is land and 924 square miles is water, primarily from Lake Michigan. Major waterways include the Des Plaines River, which flows south through the county, and the Fox River along its western border. The landscape features rolling moraines from the Wisconsin glaciation, areas of fertile farmland, and significant forest preserves like the Chain O'Lakes State Park and the Ryerson Conservation Area. It is bordered by Kenosha County and Racine County to the north, McHenry County to the west, Cook County to the south, and Lake Michigan to the east.

Demographics

As of the 2020 U.S. Census, the population was 714,342, making it the third-most populous county in Illinois after Cook County and DuPage County. The racial makeup was diverse, with significant populations identifying as White, Hispanic or Latino, Asian, and Black. The county has a high median household income, with affluent communities such as Lake Forest, Highland Park, and Lincolnshire. Educational attainment is high, with over 50% of adults holding a bachelor's degree or higher. Religious institutions include prominent congregations like Christ Church and the Baháʼí House of Worship in nearby Wilmette.

Economy

The economy is robust and diversified, anchored by major corporate headquarters and research facilities. Key employers and corporations include AbbVie, Baxter International, CDW, Trustmark, and Grainger. The Illinois Medical District has a significant presence with facilities like the Captain James A. Lovell Federal Health Care Center. The Great America amusement park in Gurnee is a major tourism draw. Other significant sectors include manufacturing, healthcare, finance, and professional services, with many businesses located in office parks along the Tri-State Tollway and near O'Hare International Airport. The Lake County Fair is an annual agricultural and commercial event.

Government and politics

The county government operates under a board system, with an elected Lake County Board overseeing legislative functions. The chief executive officer is the County Board Chairman, and other key elected officials include the State's Attorney, County Clerk, and Sheriff. At the federal level, the county is represented in the U.S. House by members such as Brad Schneider and Lauren Underwood. Politically, it is considered a swing county in presidential elections, having supported both Barack Obama and Donald Trump in recent cycles, and is a focal point for campaigns in Illinois's 10th congressional district.

Education

Primary and secondary education is provided by numerous public school districts, including Township High School District 113, Lake Forest School Districts 67 and 115, and Adlai E. Stevenson High School. Higher education institutions include the College of Lake County, a community college in Grayslake, and branch campuses of Rosalind Franklin University of Medicine and Science and DePaul University. The Lake County Forest Preserves offer extensive environmental education programs. The area is also served by the Waukegan Public Library district and the Cook Memorial Public Library District.

Transportation

Major highways include Interstate 94 (Tri-State Tollway), U.S. Route 41, U.S. Route 45, and Illinois Route 120 (Belvidere Road). Public transit is provided by Pace buses and Metra commuter rail, with lines such as the Milwaukee District North Line and the North Central Service connecting to Chicago Union Station. Waukegan National Airport provides general aviation services, while major commercial air travel is accessed via O'Hare International Airport and Milwaukee Mitchell International Airport. The Port of Waukegan is a commercial and recreational harbor on Lake Michigan.

Category:Lake County, Illinois Category:Illinois counties Category:Chicago metropolitan area Category:1839 establishments in Illinois