More info:
US Federal Population Census is Taken at 10 years intervals.
o 1790–1840. Heads of households named; other free white persons listed in categories by
age and gender; enslaved persons listed in categories by age and gender.
o 1850–60. All free persons listed by name with their age, gender, marital status, state or
country of birth, and amount of real property and personal property owned (if any).
o 1870–80 and 1900–1940. Every person listed by name with their age, gender, marital status,
state or country of birth. State or country of birth of each person’s parents given in the 1880
and 1900–30 censuses. Occupation and other information.
o 1890. Mostly destroyed as a result of a 1921 fire. Information for about 6,160 persons
survives. Most researchers have to make the “20-year leap” from 1900 to 1880. Therefore,
it is very important to obtain as much information as possible from the 1900 and later
censuses and other records to make that “leap” successful.