Illinois, USA
State
Location overview

Illinois is a state in the Midwestern United States, bordered by Wisconsin to the north, Indiana to the east, Kentucky to the southeast, Missouri and Iowa to the west across the Mississippi River, and Michigan by a short water boundary in Lake Michigan. Springfield is the state capital, while Chicago is the largest city and one of the nation’s principal economic and transportation hubs. Illinois stretches from the urbanized shores of Lake Michigan in the northeast through broad agricultural plains, river valleys and forests to the rolling hills of the Shawnee Hills in the south. Major waterways include the Mississippi, Illinois, Ohio, Wabash and Rock rivers, while the Illinois Waterway links the Great Lakes to the Mississippi River system. The state contains 102 counties, covers approximately 55,519 square miles of land and had 12,812,508 residents in the 2020 census. Admitted to the Union in 1818 as the 21st state, Illinois has long been a center for agriculture, manufacturing, finance, transportation and logistics.
Location details
Where it sits
Administrative boundaries
Related incidents
- CUSI Payment Portal Security Incident
- University of Illinois Chicago College of Medicine ransomware attack
- Woodhaven Lakes ransomware incident
- Waukegan Township cyber incident disrupted email
- Evanston Township High School ransomware attack
- Instructure Canvas breach disrupts schools worldwide
- Hasbro 2026 Unauthorized Network Access Incident
- Stryker global destructive cyberattack
- Oakland school district cyberattack and demand
- Zion Elementary School District 6 cyber incident
- DuPage County court and sheriff ransomware attack
Organizations
- 18th Judicial Circuit Court
- DuPage County
- DuPage County Circuit Court Clerk’s Office
- DuPage County Sheriff’s Office
- Evanston Township High School District 202
- fairlife
- Oakland Community School District 5
- Stryker Corporation
- University of Illinois Chicago
- University of Illinois Urbana-Champaign
- Village of Hopedale
- Waukegan Township
- Woodhaven Lakes
- Zion Elementary School District 6