Illinois

Alton

Peak Population (1960) : 43,047

Current (2020) : 25,660

Percentage Lost : 40.40%

Population Lost : 17,387

Cairo

Peak Population (1920) : 15,203

Current (2020) : 1,733

Percentage Lost : 88.62%

Population Lost : 13,470

Calumet Park

Peak Population (1970) : 10,069

Current (2020) : 7,025

Percentage Lost : 30.24%

Population Lost : 3,044

Chicago

Peak Population (1950) : 3,620,962

Current (2020) : 2,746,388

Percentage Lost : 24.16%

Population Lost : 874,574

Chicago Heights

Peak Population (1970) : 40,900

Current (2020) : 27,481

Percentage Lost : 32.81%

Population Lost : 13,419

Danville

Peak Population (1970) : 42,570

Current (2020) : 29,204

Percentage Lost : 31.40%

Population Lost :  13,366

Decatur

Peak Population (1980) : 94,081

Current (2020) : 70,901

Percentage Lost : 24.64%

Population Lost : 23,180

Dixmoor

Peak Population (1970) : 4,735

Current (2020) : 2,973

Percentage Lost : 37.22%

Population Lost : 1,762

East St. Louis

Peak Population (1950) : 82,366

Current (2020) : 18,466

Percentage Lost : 77.59%

Population Lost : 63,900

Ford Heights

Peak Population (1980) : 5,347

Current (2020) : 1,813

Percentage Lost : 66.10%

Population Lost : 3,534

Galena

Peak Population (1860) : 8,196

Current (2020) : 3,308

Percentage Lost : 59.64%

Population Lost : 4,888

Granite City

Peak Population (1970) : 40,685

Current (2020) : 27,549

Percentage Lost : 32.29%

Population Lost : 13,138

Harvey

Peak Population (1980) : 35,810

Current (2020) : 20,331

Percentage Lost : 43.23%

Population Lost : 15,479

Hometown

Peak Population (1960) : 7,479

Current (2020) : 4,343

Percentage Lost : 41.93%

Population Lost : 3,136

Kankakee

Peak Population (1990) : 30,944

Current (2020) : 24,052

Percentage Lost : 22.27%

Population Lost : 6,892

Madison

Peak Population (1950) : 7,963

Current (2020) : 3,171

Percentage Lost : 60.18%

Population Lost : 4,792

Markham

Peak Population (1970) : 15,987

Current (2020) : 11,661

Percentage Lost : 27.06%

Population Lost : 4,326

North Chicago

Peak Population (1970) : 47,275

Current (2020) : 30,758

Percentage Lost : 34.94%

Population Lost : 16,517

Park Forest

Peak Population (1960) : 29,993

Current (2020) : 21,687

Percentage Lost : 27.70%

Population Lost : 8,306

Phoenix

Peak Population (1960) : 4,203

Current (2020) : 1,708

Percentage Lost : 59.37%

Population Lost : 2,495

Riverdale

Peak Population (1970) : 15,806

Current (2020) : 10,663

Percentage Lost : 32.54%

Population Lost : 5,143

Robbins

Peak Population (1970) : 9,641

Current (2020) : 4,629

Percentage Lost : 51.99%

Population Lost : 5,012

Rock Island

Peak Population (1960) : 51,863

Current (2020) : 37,109

Percentage Lost : 28.45%

Population Lost : 14,754

Thornton

Peak Population (1970) : 3,714

Current (2020) : 2,386

Percentage Lost : 35.76%

Population Lost : 1,328

Venice

Peak Population (1950) : 6,226

Current (2020) : 1,498

Percentage Lost : 75.94%

Population Lost : 4,728

Washington Park

Peak Population (1970) : 9,524

Current (2020) : 2,592

Percentage Lost : 72.79%

Population Lost : 6,932

West Frankfort

Peak Population (1930) : 14,683

Current (2020) : 7,276

Percentage Lost : 50.45%

Population Lost : 7,407