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Illinois is a state in the midwestern United States of America. Its largest city is Chicago, which was nearly destroyed by Vesper Four Sandy Bancroft using the Machina Fini Mundi. Ekaterina agent Devin Cooper is from Illinois, residing in the city of Evanston.

During the Clue Hunt, Team Seven member Nellie Gomez initially believed a message from Lucian operative Irina Spasky pointed to a Clue hidden in the city of Peoria in Illinois, leading to Team One flying to Peoria and disguising themselves as airport personnel to intercept their rivals.

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