Every ten years, a census form arrives asking who lives in your home. It feels like a routine bit of paperwork. But the very first time America tried to count itself, it was a bold experiment carried out on horseback roads, by hand, in a country barely a few years old.
Here's the short answer. The first U.S. census counted the population as of Monday, August 2, 1790. Federal marshals and their assistants visited households across the young nation and counted 3,929,214 people. It asked only six basic questions. And both President George Washington and Secretary of State Thomas Jefferson believed the true number was higher.
Why Count at All?
The census was written right into the Constitution. Article I, Section 2 says seats in the House of Representatives and direct taxes are divided among the states according to their populations. It required the first count within three years of Congress's first meeting, and then every ten years after.
That made the census about power as much as numbers. A bigger count meant more seats in Congress for a state. The 1790 law also set a rule still used today: people are counted where they usually live and sleep.
Marshals at the Door
There was no Census Bureau yet. Congress gave the job to the U.S. marshals of each judicial district, working under Jefferson's direction. The marshals hired assistants to do the actual counting, often local people who knew their neighbors.
The law required that every household be visited. Completed lists had to be posted in two of the most public places in each area so people could inspect them. Marshals ran every census through 1870, until a dedicated bureau took over.
The questions were simple. Enumerators recorded the name of the head of each family, then counted free white males 16 and older, free white males under 16, free white females, all other free persons, and enslaved people. Everyone else in the household was a number, not a name, until the census began listing every person in 1850.
A Count the Leaders Didn't Trust
The results were published in 1791, in a report of 56 pages that cost $44,377.28 to produce. Washington and Jefferson both suspected an undercount. Possible reasons include a widely scattered population, poor roads, the limits of the technology of the day, and people who simply refused to take part.
Some places weren't counted on time, or at all. Vermont, which acted as an independent country during 1790, wasn't counted until 1791, after it joined the Union as the 14th state. The vast Northwest Territory wasn't counted at all, partly because of how hard it was to reach.
The census also recorded a painful truth about the era. In 1790, enslaved people made up 17.8% compared with the free population, the highest proportion ever recorded by any U.S. census.
Lost Pages and Sealed Records
Sadly, almost one-third of the original 1790 census records have been lost or destroyed. The returns for Delaware, Georgia, New Jersey, and Virginia disappeared sometime between 1790 and 1830.
Today, personal census records are sealed for 72 years before release. The most recent batch, from 1950, went public in April 2022. So the census forms filled out today will one day help great-great-grandchildren trace their roots, just as the 1790 count still helps us picture a nation taking its first headcount.
