The term ILL. CITY is represented by five different cities in the crossword puzzle: CHI (3 letters), PERU (4 letters), DEKALB (6 letters), HERRIN (6 letters), and MOLINE (6 letters). Chicago, Illinois, is the most populous city in the state and is represented by the 3-letter abbreviation CHI. Peru, Illinois, is a small village located in LaSalle County and is represented by the 4-letter abbreviation PERU. DeKalb, Illinois, is a city in DeKalb County and is represented by the 6-letter abbreviation DEKALB. Herrin, Illinois, is a city in Williamson County and is represented by the 6-letter abbreviation HERRIN. Moline, Illinois, is a city in Rock Island County and is represented by the 6-letter abbreviation MOLINE.