State of Illinois Email Format

Government AdministrationUnited States10001+ Employees

The State of Illinois government operates as a three-branch system—executive, legislative, and judicial—that administers public policy and services across the state. The executive branch is led by the governor and comprises a range of statewide offices along with numerous departments, agencies, boards and commissions that deliver most state services, including code departments established by the Civil Administrative Code. Illinois' government serves residents and businesses through a broad array of functions including public health, transportation, revenue, social services, and public safety, carried out by departments that cover areas such as aging, health, public safety, and transportation. Based in Illinois, United States, the state government represents a large public-sector organization with a substantial workforce. In June 2026, a development in public-private collaboration was announced as Quarterhill partnered with the Illinois Environmental Protection Agency to install and maintain traffic data collection sites across District 1 in northeastern Illinois, including the Chicago metropolitan area.

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