United States Federal Census

The Constitution of the United States mandates that a census of country be taken every ten years. After the American Revolution ended the first census of the country was taken in 1790 and the last in 2000 in 10 year intervals.

Census YearFormatCensus Questions Asked**
1790 PDF Name of family head; free white males of 16 years and up; free white males under 16; free white females; slaves; other persons.
1800 PDF Names of family head; if white, age and sex; race; slaves.  
1810 PDF Name of family head; if white, age and sex; race; slaves.  
1820 PDF Name of family head; age; sex; race; foreigners not naturalized; slaves; industry (agriculture, commerce, and manufactures).  
1830 PDF Name of family head; age; sex; race; foreigners not naturalized; slaves; industry.  
1840 PDF Name of family head; age; sex; race; slaves; number of deaf and dumb; number of blind; number of insane and idiotic and whether in public or private charge; number of persons in each family employed in each of six classes of industry and one of occupation; literacy; pensioners for Revolutionary or military service.
1850 PDF Name; age; sex; race; whether deaf and dumb, blind, insane, or idiotic; value of real estate; occupation; birthplace; whether married within the year; school attendance; literacy; whether a pauper or convict. Supplemental schedules for slaves, and persons who died during the year.  
1860 PDF Name; age; sex; race; value of real estate; value of personal estate; occupation; birthplace; whether married within the year; school attendance; literacy; whether deaf and dumb; blind, insane, idiotic, pauper, or convict; number of slave houses. Supplemental schedules for slaves, and persons who died during the year.
1870 PDF Name; age; race; occupation; value of real estate; value of personal estate; birthplace; whether parents were foreign born; month of birth if born within the year; month of marriage if married within the year; school attendance; literacy; whether deaf and dumb, blind, insane, or idiotic;male citizens 21 and over, and number of such persons denied the right to vote for other than rebellion. Supplemental schedule for persons who died during the year.  
1880 PDF Address; name, relationship to family head; sex; race; age; marital status; month of birth if born within the census year; occupation; months unemployed during the year; sickness or temporary disability; whether blind, deaf and dumb, idiotic, insane, maimed, crippled, bedridden, or otherwise disabled; school attendance; literacy; birthplace of person and parents. Supplemental schedules for persons who died during the year.
1890   General schedules destroyed. Supplemental schedules for Union veterans of the Civil War and their widows.  
1900 PDF Address; name; relationship to family head; sex; race; age; marital status; number of years married; for women, number of children born and number now living; birthplace of person and parents; if foreign born, year of immigration and whether naturalized; occupation; months not employed; school attendance; literacy; ability to speak English; whether on a farm; home owned or rented and if owned, whether mortgaged.
1910 PDF Address; name; relationship to family head; sex; race; age; marital status; number of years of present marriage for women, number of children born and number now living; birthplace and mother tongue of person and parents; if foreign born, year of immigration, whether naturalized, and whether able to speak English, or if not, language spoken; occupation, industry, and class of worker; if an employee, whether out of work during year; literacy; school attendance; home owned or rented; if owned, whether mortgaged; whether farm or house; whether a survivor of Union or Confederate Army or Navy; whether blind or deaf and dumb.  
1920 PDF Address; name; relationship to family head; sex; race; age; marital status; if foreign born, year of immigration to the U.S., whether naturalized, and year of naturalization; school attendance; literacy; birthplace of person and parents; mother tongue of foreign born; ability to speak English; occupation, industry, and class of worker; home owned or rented; if owned, whether free or mortgaged.
1930 PDF Address; name; relationship to family head; home owned or rented; value or monthly rental; radio set; whether on a farm; sex; race; age; marital status; age at first marriage; school attendance; literacy; birthplace of person and parents; if foreign born language spoken in home before coming to U.S., year of immigration, whether naturalized, and ability to speak English; occupation, industry, and class of worker; whether at work previous day (or last regular working day); veteran status; for Indians, whether of full or mixed blood, and tribal affiliation.
    Descriptions from www.census.gov