The Social Explorer produces maps and reports of US Census Tract level data from 1940-2000. Using high quality maps and data, they make available the full contents of the tract data for the United States for the full period. The data can also be exported as excel spreadsheets for easy reuse.

Willcox, Walter Francis, 1861-1964.. Divorce problem; a study in statistics.New York, AMS Press [1969]
Call#: Van Pelt Library HQ814 .W6 1969

Historical Census Browser
Population and housing data for all U.S. states and counties, 1790 to 1960, based on decennial census of population and housing. Provides basic counts of population and housing, including race, gender, and some measure of household size and composition. For 1840 to 1960, economic characteristics such as education and occupation are included. Later decades have many variables, including ancestry, literacy, and income variables.

Decennials - Census of Population and Housing
PDF-format versions of historic US decennial census volumes, 1790 to present. Topics covered include basic counts of population and housing, with race and gender, for the nation, states, counties, townships and municipalities, and some small areas (e.g., wards). From 1840 to present, social and economic information is provided.
Holdings: 1790 to present (backfile in progress: 1790-1860, 1990-2000 available)

Historical Statistics of the United States Millenial Edition
The best starting-place for statistical information on the United States, for the colonial era and 1790-2000 (including the Confederate States of America). Presents 37,339 data series on population (including vital statistics, immigration and emigration), work and welfare (including labor, slavery, education, health, economic inequality and poverty, social insurance and public assistance), economic structure and performance (includuing national income and national product, business cycles, prices, consumer expenditures, savings, capital, and wealth, business organization, and financial markets and institutions), business sectors and industries, and governance and international relations (including government finance, elections and politics, crime and law enformcement, wars, armed forces, and veterans, and international trade and exchange rates).