Illinois

Administrative divisions

Illinois is a state of the United States with FIPS state code 17^[2]. Below the state level are counties (or independent cities), then municipalities and neighborhoods^[2].

Basic facts

• FIPS state code: 17^[2]
• Capital: Springfield^[1]
• Population: about 12,549,689 (2023 estimate)^[2]
• Area: 149,995 km2^[1]
• Admitted to the Union: 1818^[1]
• Time zone: Central Time (UTC-6/-5)^[1]
• ISO 3166-2: US-IL^[1]

Parent division

Located in United States.

Subdivisions

Major counties: Cook County, DuPage County, Lake County, Will County, Kane County.

Major cities: Chicago, Aurora, Naperville, Joliet.