2000 United States Census

The Twenty-second United States Census, known as Census 2000 and conducted by the Census Bureau, determined the resident population of the United States on April 1, 2000, to be 281,421,906, an increase of 13.2% over the 248,709,873 people enumerated during the 1990 Census. This was the twenty-second federal census and was at the time the largest civilly administered peacetime effort in the United States.

Approximately 16 percent of households received a "long form" of the 2000 census, which contained over 100 questions. Full documentation on the 2000 census, including census forms and a procedural history, is available from the Integrated Public Use Microdata Series.

Data availability

Microdata from the 2000 census is freely available through the Integrated Public Use Microdata Series. Aggregate data for small areas, together with electronic boundary files, can be downloaded from the National Historical Geographic Information System. Personally identifiable information will be available in 2072.

1880 United States Census

The United States Census of 1880 was the tenth United States Census conducted by the Census Bureau during June 1880. It was the first time that women were permitted to be enumerators. The Superintendent of the Census was Francis Amasa Walker.

Data collected

Five schedules were authorized by the 1880 census act, four of which were filled out byent of certain members of the population. Experts and special agents also were employed to collect data on valuation, taxation, and indebtedness; religion; libraries; colleges, academies, and schools; newspapers and periodicals, and wages.

Special agents were also charged with collecting data on specific industries throughout the country, and included the manufactures of iron and steel; cotton, woolen, and worsted goods; silk and silk goods; chemical products and salt; coke and glass; shipbuilding; and all aspects of fisheries and mining, including the production of coal and petroleum.

Full documentation for the 1880 population census, including census forms and enumerator instructions, is available from the Integrated Public Use Microdata Series, which contains microdata.

1830 United States Census

The United States Census of 1830, the fifth census undertaken in the United States, was conducted on June 1, 1830. The only loss of census records for 1830 involved some countywide losses in Massachusetts, Maryland, and Mississippi.

It determined the population of the 24 states to be 12,866,020, of which 2,009,043 were slaves. The center of population was about 170 miles (274 km) west of Washington, D.C. in present-day Grant County, West Virginia.

Census questions

The 1830 census asked these questions:

1940 United States Census

The Sixteenth United States Census, conducted by the Census Bureau, determined the resident population of the United States to be 132,164,569, an increase of 7.3 percent over the 1930 population of 123,202,624 persons. The census date of record was April 1, 1940. A number of new questions were asked including where people were 5 years before, highest educational grade achieved, and information about wages. This census introduced sampling techniques; one in 20 people were asked additional questions on the census form. Other innovations included a field test of the census in 1939.

Census questions

The 1940 census collected the following information: