On June 21, 1788, New Hampshire cast the deciding vote to ratify the U.S. Constitution.  Key to this founding document of the United States is the requirement that we conduct a population census every 10 years to apportion the U.S. House of Representatives.

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After a contentious Constitutional Convention and months' long ratification process, the U.S. Constitution became the official framework for the government of the United States of America on June 21, 1788. State delegates wrote the Constitution during a 4-month Constitutional Convention held in Philadelphia, PA. After signing the Constitution on September 17, 1787, they sent it to the states for ratification. Nine of 13 states were required to ratify the Constitution before it would be accepted as the nation's founding document. Delaware was first to approve it on December 7, 1787, followed by Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, and South Carolina. On June 21, 1788, New Hampshire cast the ninth vote in favor of ratification. Today, the U.S. Constitution continues to guide our government, protect the rights of all Americans, and inspire democracies around the world.

The Articles of Confederation guided the government of the United States following the American Revolution. Adopted by the Continental Congress on November 15, 1777, and effective beginning on March 1, 1781, this "first constitution of the United States" established a "league of friendship" between the 13 independent states. However, the strength of the states and weakness of the federal government nearly doomed the young nation. Without the voluntary agreement and cooperation of the states, the federal government found it was unable to effectively regulate commerce, levy taxes, control the printing of money, settle disputes between states, or conduct foreign policy. To avert a crisis between federal and state governments, Alexander Hamilton convinced the Confederation Congress to meet in Philadelphia, PA, to discuss revisions to the Articles of Confederation.

State delegates gathered at Philadelphia's Independence Hall in May 1787 to debate the strengths and weaknesses of the Articles of Confederation. With George Washington leading the convention, delegates soon agreed that an entirely new document should be drafted. Between May and September 1787, the delegates crafted a 3-branch system of government with an executive branch headed by a president elected by the electoral college, a legislative branch, and an independent judicial branch. Some of the most heated discussion focused on the establishment of the legislative branch. Virginia delegate Edmund Randolph proposed a bicameral legislature with membership of both houses determined by the states' population. Delegates from the smaller states opposed the plan, rightly believing populous states would dominate government. William Paterson of New Jersey suggested a single house with equal representation for all states, regardless of population. The convention was deadlocked and delegates from the smaller states threatened to return home. On July 5, Connecticut delegate Roger Sherman proposed his "Connecticut Plan" in which all states would have equal representation in the Senate and proportional representation based on each state's population in the U.S. House of Representatives. Delegates voted to accept Sherman's "Great Compromise" on July 16, requiring the apportionment of the U.S. House of Representatives following a regularly conducted census in Article I, Section 2 of the Constitution: "Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons. The actual Enumeration shall be made within three Years after the first Meeting of the Congress of the United States, and within every subsequent Term of ten Years, in such Manner as they shall by Law direct."

With the most contentious issues resolved, a Committee of Detail prepared a draft Constitution for delegates to begin reviewing in early August and on September 17, 1787, 39 of the Constitutional Convention's 55 delegates signed the U.S. Constitution. It was then sent to the states for debate and ratification votes. Between December 7, 1787, and June 21, 1788, the required 9 of 13 states ratified the Constitution making it the official framework for the government of the United States of America. All 13 states eventually ratified the U.S. Constitution by May 29, 1790.

The 1st Congress addressed the constitutionally-required census during its second session, passing "An Act Providing for the Enumeration of the Inhabitants of the United States" that President George Washington signed into law on March 1, 1790. Taken as of the first Monday of August 1790, U.S. marshals and their assistants traveled to every household in the 13 States, the districts of Kentucky, Maine, and Vermont, and the Southwest Territory (Tennessee). Using schedules of their own design, they collected data about the number of free White males (under 16 years and over 16 years old), free White females, other free persons, and slaves.

Having completed the constitutionally-mandated head count of the nation's 3,929,214 people, Congress next had to agree on how many seats there would be in the U.S. House of Representatives and how to apportion them to the states. The Constitution offered only vague guidance, instructing "that there shall be not less than one hundred Representatives, nor less than one Representative for every forty thousand persons." President George Washington vetoed a bill promoted by Alexander Hamilton (Hamilton/Vinton Method) and signed the bill favored by Thomas Jefferson and James Madison (the Jefferson Method) that created 105 seats in the House of Representatives and set the ratio of people to seats at 30,000:1, and later adjusted to 33,000:1 by the April 14, 1792, Act Providing for Apportionment following the 1790 Census. Using the 1790 Census results, the U.S. House of Representatives was apportioned as follows: Virginia–19, Massachusetts–14, Pennsylvania–13, New York–10, North Carolina–10, Maryland–8, Connecticut–7, South Carolina–6, New Jersey–5, New Hampshire–4, Georgia–2, Kentucky–2, Rhode Island–2, Vermont–2, and Delaware–1.

For 235 years, the U.S. Constitution has successfully guided the government of the United States, safeguarded the rights of the states and American people, and ensured the nation would continue to evolve as society changed. As the United States has grown, the constitutionally-mandated censuses have not only aided in the apportionment of the U.S. House of Representatives, they have also recorded the nation's demographic and economic evolution. You can learn more about the Founding Fathers, the Constitution, and the growth of the United States using census data and records. For example:

• On September 17, 1787, 39 of 55 delegates to the Constitutional Convention signed the newly written Constitution amending the 1777 Articles of Confederation. Many of Thomas Jefferson's ideas were included within the final document, but he did not sign the Constitution because he and fellow Founding Father John Adams were on diplomatic missions in Europe. Included among the 39 signatories were: future presidents George Washington and James Madison; Connecticut politicians Roger Sherman and William S. Johnson; Delaware senator Richard Bassett; Delaware district court judge Gunning Bedford; businessman and Delaware's first postmaster Jacob Broom; Maryland politicians Daniel Carroll, James McHenry, and Daniel of St. Thomas Jennifer; Massachusetts delegate Nathaniel Gorham; New Hampshire senator and governor John Langdon; New York delegate Alexander Hamilton; North Carolina politician Richard Spaight; Pennsylvania politicians George Clymer and Jared Ingersoll; Pennsylvania's first governor Thomas Mifflin; Pennsylvania politician and diplomat Gouverneur Morris; South Carolina politicians Pierce Butler, Charles Pinckney; and original associate justice of the U.S. Supreme Court, second chief justice of the United States John Rutledge.
  
  
• Article I, Section II of the U.S. Constitution states that, "Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and excluding Indians not taxed, three fifths of all other Persons. The actual Enumeration shall be made within three Years after the first Meeting of the Congress of the United States, and within every subsequent Term of ten Years, in such Manner as they shall by Law direct." In accordance with this requirement, U.S. marshals and their assistants enumerated the nation as of the first Monday of August, 1790. The first census counted 3,929,214 people living in the United States. In accordance with the Constitution, the United States has conducted a population count every 10 years since then. By 1880, the population of the United States reached 50,189,209. The population topped 100 million by 1920; 200 million by 1970; and 300 million by 2010. Most recently, the 2020 Census reported the nation's population was 331,449,281. The Census Bureau predicts that the U.S. population will exceed 355 million by 2030.
  
  
• Jacob Shallus was an assistant clerk to the Pennsylvania General Assembly working at the Pennsylvania State House (Independence Hall) when the Constitutional Convention met there from May 14 to September 17, 1787. When the Founding Fathers finished drafting the Constitution, they paid Shallus $30 (approximately $985 in 2023) to transcribe—or "engross"—the document onto four sheets of parchment. His finished document is on display at the National Archives' Rotunda for the Charters of Freedom in Washington, DC. Although professional calligraphers still produce beautiful, handwritten documents—including the White House's own Graphics and Calligraphy Office—the majority of printed documents are produced by the nation's 21,615 printing establishments (NAICS 32311). The Census Bureau's County Business Patterns series found that these establishments employed 371,385 people for the pay period that included March 12, 2022.
  
  
• The constitutionally-required population census was conducted by U.S. marshals and their assistance every 10 years from 1790 through 1870. The 1879 Census Act required that specially-hired and trained enumerators conduct the census beginning in 1880. These enumerators were temporary hires as the Census Office only opened to conduct the census and closed following tabulation and publication of the census data. Recognizing the need to maintain a permanent cadre of trained census takers and staff, Congress legislated a permanent Census Bureau within the U.S. Department of the Interior on March 6, 1902. The Census Bureau moved to the newly created Department of Commerce and Labor in 1903, and remained within the Department of Commerce following its separation from the Department of Labor in 1913. Today, the Census Bureau conducts more than 100 constitutionally- and congressionally-mandated surveys annually that collect data about the nation's population, households, businesses, and government entities.
  
  
• Commercial printers John Dunlap and David C. Claypoole not only published the first copies of the Declaration of Independence on the evening of July 4, 1776, they also published the first printed copies of the U.S. Constitution. Along with publishing the Constitution in their Pennsylvania Packet newspaper, they printed 500 copies for use by the Continental Congress. Today, only 13 of these first printed copies of the Constitution are known to exist. Ten are available for public viewing at the American Philosophical Society, Philadelphia, PA; Crystal Bridges Museum of Art, Bentonville, AR; Delaware Hall of Record, Dover, DE; Historical Society of Pennsylvania, Philadelphia, PA; Library of Congress (2 copies), Washington, DC; New Jersey State Library, Trenton, NJ; and New York Historical Society, New York City, NY. One of the three privately-owned Dunlap and Claypoole Constitution copies sold for more than $43 million in 2021.
  
  
• Americans associate the Thanksgiving holiday with the autumn harvest, turkey, family gatherings, and football, but did you know the first thanksgiving observed by the newly established United States celebrated the Constitution? On October 3, 1789, President George Washington designated November 26, 1789, as the first national day of thanksgiving to celebrate the ratification of the Constitution and founding of the United States of America.
  
  
• In addition to the U.S. Constitution, Declaration of Independence, and Bill of Rights, the National Archives also houses millions of census records. While our founding documents are housed in the National Archives Rotunda for the Charters of Freedom, millions of microfilmed and digital census schedules are available free of charge to researchers visiting National Archives facilities throughout the United States. Several organizations also make digital census records available via public libraries and subscription services. Learn more about accessing the publicly available 1790 to 1950 schedules at the National Archives Census Records webpage.
  

June 1 was Census Day in 1830.

President John Quincy Adams recommended moving Census Day from August to June in his December 2, 1828, address to Congress. The move gave U.S. marshals conducting the censuses more time to complete the count.

The 1830 Census was also the first to use printed schedules to collect census data. Prior to 1830, marshals used whatever paper they had and designed their own forms (1790, 1800, 1810, 1820) which could complicate clerks' task of compiling the data.

June 1 (June 2 in 1890) remained Census Day until 1910, when it moved to April 15. Congress moved Census Day to January 1 in 1920. The Census Bureau has conducted the decennial census as of April 1 since 1930.

The Census Act of 1879 made decennial census records confidential with severe penalties for disclosing the data they contain. In 1954, Congress codified the rules regulating the confidentiality of census data as Title 13, U.S. Code.

Today, the census schedules collected from each household remain confidential for 72 years after Census Day. Did you know that length of time was initially based on an informal agreement, though?

In 1942, the U.S. Census Bureau completed the transfer of the 1790 to 1870 census records to the National Archives. The records were safe from disaster (like the 1921 fire that destroyed most of the 1890 schedules), preserved, and made available to the public.

The transfer also happened to take place 72 years after the Census Bureau conducted the 1870 Census.

Eight years later, Congress passed the 1950 Federal Records Act. The act opened federal records—including census records—to the public after just 50 years.

Census Bureau director Roy V. Peel believed that given the personal data collected by the census, these records should have a longer period of confidentiality.

Following a series of letters between Peel and Archivist of the United States Wayne Grover, the two agreed to apply the 1870 Census' precedent of 72 years to the release of future census schedules.

In accordance with their agreement, the National Archives made the 1880 records publicly available in 1952 and released the surviving 1890 records in 1962.

Most recently, the National Archives released records rom the 1950 Census on April 1, 2022. Future releases are planned every 10 years thereafter, with records from the 2020 Census becoming available in 2092.

Although census records are confidential for 72 years, individuals may request more recent records from the Census Bureau's Age Search Service. This service provides certified records from censuses that are still protected by the 72-year rule to the named person, his or her heirs, or legal representatives.

Individuals can request their records using form BC-600, Application for Search of Census Records (form BC-600sp, Solicitud Para Busqueda De Registros Censales).

U.S. courts ruled as early as 1870 that Congress has the constitutional power to require both an enumeration of the nation's population and the collection of other statistics.

In the 1870 Legal Tender Cases, the U.S. Supreme Court ruled that, "Congress has repeatedly directed an enumeration not only of free persons in the states but of free persons in the territories, and not only an enumeration of persons but the collection of statistics respecting age, sex, and production.

Who questions the power to do this? Indeed the whole history of the government and of congressional legislation has exhibited the use of a very wide discretion, even in times of peace and in the absence of any trying emergency, in the selection of the necessary and proper means to carry into effect the great objects for which the government was framed, and this discretion has generally been unquestioned, or, if questioned, sanctioned by this Court. This is true not only when an attempt has been made to execute a single power specifically given, but equally true when the means adopted have been appropriate to the execution, not of a single authority, but of all the powers created by the Constitution."

In 1901, the Circuit Court for the Southern District of New York ruled in United States v. Moriarity that the Constitution does not prohibit, "gathering of other statistics, if necessary and proper, for the intelligent exercise of other powers enumerated in the constitution, and in such case there could be no objection to acquiring this information through the same machinery by which the population is enumerated, especially as such course would favor economy as well as the convenience of the government and the citizens."

The courts more recently reaffirmed the constitutionality of the Census Bureau's collection of data to support government programs and operations in Department of Commerce v. U.S. House of Representatives (1999), and Morales v. Daley (S.D. Tex. 2000).