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 | Official name: State of Illinois Illinois postal code abbreviation: IL You may also be interested in the answers to the following questions: Total area: 149 998 km2 ✅ What is the largest city by population in Illinois?- Largest Illinois cities by population: Chicago ✅ What is the capital of Illinois?- State capital of Illinois: Springfield ✅ What is the population of Illinois?- Illinois state population 2025: 12 869 257 |