Here is information on all available census indexes:1790 to 1850 is indexed by Head of Household only, however,
if your person is living in a household with a different last name,
he/she will also be indexed.1860 is by Head of Household at Heritage Quest, but ancestry.com is in the process of compiling an ALL name index.
Ancestry is avail. free at most public libraries and by subscription.1870 and 1880 is an all name index. 1880 is also available free online at www.familysearch.org
1890 census was destroyed in 1921 by fire & water while in storage. Only some fragments remain for the following states: Alabama, District of Columbia, Georgia, Illinois, Minnesota, New Jersey, New York, North Carolina, Ohio, South Dakota and Texas. Fragments means anything from 3 or 4 pages from the whole state, to a few counties, townships, etc.
1900 to 1930 every person has information including month and year born. When Immigrated, military info. etc.
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**From 1790 to 1840 only the Head of Household was listed in the census with other family members designated in columns by age/sex.**From 1850 to 1870, all people living in the household were listed, but not their relationships.
**Beginning in 1880, all people living in the household were listed along with their relationship to the HEAD of Household only----not their relationship to each other.
CENSUS ENUMERATION DATES:
1790 to 1820 -- 1st Monday in August
1830 to 1900 -- June 1st
1910 -- April 15th
1920 -- January 1st
1930 -- April 1st
