The Cook County Democratic Party is one of the strongest and most historic local Democratic organizations in America. Since 1915, Cook County Democratic voters have directly elected ward and township committeepersons, and those committeepersons in turn elect a party chair. These chairs have led our party throughout its history:

2018–present

Toni Preckwinkle

2007–2018

Joseph Berrios

1990-2007

Thomas G. Lyons

1982-1987

Edward Vrdolyak

1976-1982, 1987-1990

George Dunne

1953-1976

Richard J. Daley

1950-1953

Joseph L. Gill

1946-1950

Jacob Arvey

1943-1946

Edward J. Kelly

1931-1943

Patrick Nash

1928-1931

Anton Cermak

1920-1928

George Brennan

1915-1920

Roger C. Sullivan