How to read a census record, one household at a time.
A census record shows one household on the day the census was taken: who lived there, how old they were, where they were born, and more questions as the years went on. U.S. census records become public 72 years after they're taken, so every census from 1790 to 1950 is open today. Start with the most recent census you can find someone in, and work backwards ten years at a time.
What each census tells you.
- 1790 to 1840: only the head of each household is named. Everyone else is a count by age and sex.
- From 1850: every free member of a household is named, with an age and a birthplace. This is where most families first appear together.
- 1880: the first census to say how each person is related to the head of the household, and the first to ask where each person's parents were born.
- 1890: most of it was destroyed by a fire, so there's usually a twenty-year gap between 1880 and 1900.
- 1950: the most recent census open to the public, released in April 2022. The 1960 census opens in April 2032.
Reading one line.
Each person is one row: name, relationship to the head (from 1880), age, where they were born, and often their work and whether they could read. The census taker wrote down what one person at the door told them, so names are spelled as they sounded and ages can drift by a year or two between censuses. Treat each row as one witness's account, and check it against the census ten years before and after.
Read the neighbors too. Families often lived near each other, and a mother's parents or a married sister may be two doors down.
Where to find them.
The National Archives holds the census schedules from 1790 to 1950, and most have been digitized by its partners. The Census Bureau notes that many public libraries give free access to the subscription services that hold them.
Or just ask.
AncestralFire does these steps with you. Tell it one name, and it reads your tree, searches FamilySearch Family Tree once you connect it, and tells you what it found, with the source behind each fact. A real answer:
What doesn't the tree know about Patrick?
Your imported file records Patrick's birth around 1823, immigration to Boston around 1847, work as a cooper, and death in 1858. A note says he died of consumption, but the file has no attached birth or death record or 1850 census to verify details; his parents are named Patrick and Mary Johanna, but their dates aren't given.
From the Kennedy family's published tree: it names the census that would check Patrick's details, and says it isn't there yet.
See a whole conversation on How it works, or what it finds in one family: The Kennedy family tree, from Wexford to Dallas.
Keep reading.
- How to find an ancestor's death certificate. A death certificate is kept by the state or county where the person died, not the federal government, and not necessarily where they lived or were buried.
- How to find where your ancestors came from. Work back through your family until you reach the person who arrived, then look for the three records that say where they came from: the census, which asked about immigration in 1900 through 1930; the ship's passenger list, which U.S.