The 1870 census started on June 1, 1870 and it was taken over a 5-month time period. Each person was recorded in the 1870 census according to their place of residence on June 1, 1870, regardless of when the enumerators actually questioned those people.
The enumerators were required to number the records according to the order in which they visited each residence. Birthdays were also recorded in a more accurate way, especially for children who weren’t yet one year old. Ages were recorded as fractions. For example, a child who was 3 months old was recorded as 3/12. Sex, color, profession, real estate ownership, literacy level and mental and physical competency levels of each person were also recorded in the 1870 census.