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The geography of Illinois is quite flat and fertile. Explore the state of Illinois and the geography of major cities like Springfield and Chicago.

Featured Article:  Geography of Rock Island

Rock Island, Illinois, the seat of Rock Island County. It is situated at the junction of the Mississippi and Rock rivers. See more »

Chicago

Chicago

Chicago, Illinois, the largest city in the state and, since 1982, the third most populous in the United States, after New York City and Los Angeles.

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Geography of Illinois

Geography of Illinois

Illinois, one of the Midwestern states of the United States. It is bounded by Wisconsin, Indiana, Kentucky, Missouri, and Iowa.

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Geography of Alton

Alton, Illinois, a city in Madison County. It lies on the Mississippi River near the mouths of the Missouri and Illinois rivers.

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Geography of Arlington Heights

Arlington Heights, Illinois, a city in Cook County. It is a residential suburb about 23 miles (37 km) northwest of downtown Chicago.

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Geography of Aurora-Illinois

Aurora, Illinois, a city in Kane County. It lies on the Fox River 34 miles (55 km) west of downtown Chicago.

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Geography of Belleville-Illinois

Belleville, Illinois, the seat of St. Clair County. It is in the southwestern part of the state, near St.

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Geography of Berwyn

Berwyn, Illinois, a city in Cook County, about nine miles (14 km) west of downtown Chicago.

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Geography of Bloomington-Illinois

Bloomington, Illinois, the seat of McLean County, about 125 miles (200 km) southwest of Chicago.

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Geography of Calumet City

Calumet City, Illinois, a city in Cook County. It adjoins Chicago on the southeast.

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Geography of Champaign

Champaign, Illinois, a city in Champaign County. It is in a fertile farming region, 125 miles (200 km) southwest of Chicago.

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Geography of Chicago Heights

Chicago Heights, Illinois, a city in Cook County about 25 miles (40 km) south of downtown Chicago.

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Geography of Cicero

Cicero, Illinois, a municipality in Cook County immediately west of Chicago. Products include household appliances; telephone, radio, and electronic equipment; asbestos; plastics; forgings; machinery; and adhesives.

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Geography of Danville

Danville, Illinois, the seat of Vermilion County. Danville is on the Vermilion River, about 120 miles (190 km) south of Chicago.

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Geography of Decatur

Decatur, Illinois, the seat of Macon County. It is in the central part of the state on the Sangamon River, 170 miles (275 km) southwest of Chicago.

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Geography of Des Plaines

Des Plaines, Illinois, a city in Cook County. It lies on the Des Plaines River, adjacent to O'Hare International Airport 18 miles (29 km) northwest of downtown Chicago.

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Geography of Downers Grove

Downers Grove, Illinois, a suburb in Du Page County, 21 miles (34 km) west-southwest of downtown Chicago.

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Geography of East St. Louis

East St. Louis, Illinois, a city in St. Clair County. It lies on the Mississippi River opposite St.

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Geography of Elgin

Elgin, Illinois, a city in Kane and Cook counties. It is on the Fox River, 36 miles (58 km) northwest of downtown Chicago.

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Geography of Elmhurst

Elmhurst, Illinois, a city in Du Page County, about 16 miles (26 km) west of downtown Chicago.

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Geography of Evanston

Evanston, Illinois, a city in Cook County. It is on the shore of Lake Michigan, immediately north of Chicago.

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