The 1840 Census was the sixth enumeration conducted of the United States population as provided for in the U.S. Constitution. The 17 million people enumerated represented a 32.7% increase over the prior census. Enumerators of the 1840 census were asked to include the following categories in the census: name of head of household; number of free white males and females in age categories: 0 to 5, 5 to 10, 10 to 15, 15 to 20, 20 to 30, 30 to 40, 40 to 50, 50 to 60, 60 to 70, 70 to 80, 80 to 90, 90 to 100, over 100; the name of a slave owner and the number of slaves owned by that person; the number of male and female slaves and free "colored" persons by age categories; the number of foreigners (not naturalized) in a household; the number of deaf, dumb, and blind persons within a household; and town or district, and county of residence.
For the first time, the 1840 census also asked the ages of revolutionary war pensioners and the number of individuals engaged in mining, agriculture, commerce, manufacturing and trade, navigation of the ocean, navigation of canals, lakes and rivers, learned professions and engineers; number in school, number in family over age twenty-one who could not read and write, and the number of insane.
The 1840 Census was the sixth enumeration conducted of the United States population as provided for in the U.S. Constitution. The 17 million people enumerated represented a 32.7% increase over the prior census. Enumerators of the 1840 census were asked to include the following categories in the census: name of head of household; number of free white males and females in age categories: 0 to 5, 5 to 10, 10 to 15, 15 to 20, 20 to 30, 30 to 40, 40 to 50, 50 to 60, 60 to 70, 70 to 80, 80 to 90, 90 to 100, over 100; the name of a slave owner and the number of slaves owned by that person; the number of male and female slaves and free "colored" persons by age categories; the number of foreigners (not naturalized) in a household; the number of deaf, dumb, and blind persons within a household; and town or district, and county of residence. 
