1840 Census Reports: Decennial Population and Housing Censuses Research Guide

NCSU Libraries Guide to Census Data Resources - Provides links to online and other electronic data sources.
US Census Bureau 1840 Documents as PDFs

Questionnaire, instructions, and table headers
* Questionnaire description and Instructions to Marshals - from Measuring America (Sept. 2002)
* Table headers - from Seventh Census of the United States, 1850 (I8.5:1)

Sixth Census or Enumeration of the Inhabitants of the United States
U.S. Documents C3.14:840/rep 1990 v.1 (reclassed from I7.5:1)
* GEOGRAPHIES:   Nation, states, Territories, Counties, Ward, Town, Township, Parish, Precinct, Hundred or District
* CONTENTS:   Sex and Age of Free White Persons, Free Colored Persons, Slaves; Numbers of deaf, dumb, blind, insane white persons, colored persons; Numbers of persons employed in seven categories; Numbers of schools and educational attainment
* Age ranges reported for Free White Persons by sex: under 5, 5-9, 10-14, 15-19, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80-89, 90-99, 100+
* Age ranges reported for Free Colored Persons, and Slaves, both by sex: under 10, 10-23, 24-35, 36-54, 55-99, 100+
* Deaf and dumb totals for White Persons, and Colored, reported by age ranges: under 14, 14-24, 25+
* Blind totals for White Persons, and Colored
* Insane totals at Private and Public charge for White Persons, and Colored
* Employment - Persons employed in Mining; Agriculture; Commerce; Manufactures and trade; Navigation of the ocean; Navigation of canals, lakes and rivers; Learned professions and engineers; Military pensioners
* Education - Totals for Universities/colleges, Number of students, Academies/grammar schools, Number of scholars, Primary/common schools, Number of scholars, Scholars at public charge, White persons over 20 who cannot read or write

Compendium of the Enumeration of the Inhabitants and Statistics of the United States
Census Bureau PDF file
U.S. Documents C3.14:840/rep 1990 v.3 (reclassed from I7.2:C73/1))
* GEOGRAPHIES:   States, Territories, Counties
* QUESTIONS:   Same as in v.1 above
* Employment figures (pages 106-364) are reported by more occupations than are given in v. 1