From Ancestry.com
The 1820 census was begun on 7 August 1820. The count was due within six months but was extended by law to allow completion within thirteen months.
Questions Asked in the 1820 Census
Name of family head; number of free white males and females in age categories 0 to 10, 10 to 16, 16 to 18, 16 to 26, 26 to 45, 45 and older; number of other free persons except Indians not taxed; number of slaves; and town or district and county of residence. Additionally, the 1820 census for the first time asked the number of free white males 16 to 18; number of persons not naturalized; number engaged in agriculture, commercial, or manufacture; number of “colored” persons (sometimes in age categories); and number of other persons except Indians.
The added questions in the 1820 census break down ages so that it is possible to gauge the age of young men more accurately. However, the redundancy of asking the number of free white males “Between 16 and 18,” and “Of 16 and under 26,” “Of 26 and under 45,” “Of 45 and upwards,” is frequently cause for confusion in attempts to calculate the total number of persons in a given household. The column regarding naturalization status may be some indication of length of residency in the United States and the possibility of finding naturalization papers in a local court.
The questions asked regarding number and nature of those involved in agriculture, commercial, or manufacturing enterprises allow researchers to make some distinctions about the occupation of the head and any others in the household who were employed. Some, though admittedly not much, identifying information is available where schedules go beyond stating the number of “colored” persons and provide an age breakdown as well. The 1820 manufacturing schedules are on twenty-nine separate rolls of microfilm.
23 Areas were enumerated
Connecticut, Delaware, District of Columbia, Georgia, Illinois, Indiana, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Mississippi, New Hampshire, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, Tennessee, Vermont and Virginia