The Capital of Illinois is Springfield and there are many synonyms for this term. Some of the synonyms for Capital of Illinois are, Seat of Government of Illinois, Capital City of Illinois, and Metropolis of Illinois. Other synonyms include Political Center of Illinois, Administrative Capital of Illinois, and Governing City of Illinois. These synonyms all refer to the same place, but they highlight different aspects of the city's role as the center of government and administration in Illinois. Regardless of the term used, Springfield remains an important city for the state of Illinois. It is the location of the Illinois State Capitol Building and many other important government offices and institutions.