This study presents time-series demographic, economic, and political data for Chicago, covering each year from 1840 to 1973. Included are election returns, indicators of ethnic and racial composition of the city, political structure, municipal court operations, judicial recruitment, police activities, and selected municipal expenditures. Economic variables measure employment, unemployment, and manufacturing activities. National and local election returns and data on ethnic composition are also provided for individual city wards for each decade between 1890 and...