
The United States Constitution, Article 1, Section 2, also known as the Enumeration Clause, mandates that a census be conducted every 10 years to count the entire population for the purpose of legislative representation. The Enumeration Clause reflects the constitutional determination that the distribution of political power in the House of Representatives should be based on the population of each state, rather than its wealth. The Enumeration Clause also guarantees each state at least one representative. The census is conducted by the United States Census Bureau, which uses various methods, including hot-deck imputation, to ensure an accurate count of the population. The census has been challenged in the courts several times, with debates surrounding the inclusion of certain questions and the accuracy of the count.
| Characteristics | Values |
|---|---|
| Purpose | Legislative representation |
| Frequency | Every 10 years |
| Subjects or questions | Not specified by Title 13, U.S. Code |
| Notification of subjects | Due 3 years before census |
| Actual questions | Due 2 years before census |
| Constitutional basis | Article I, Section 2, Clause 3 (Enumeration Clause or Census Clause) |
| Legal purpose | Apportionment of representatives among states |
| Number of seats | 435 |
| Minimum number of seats per state | 1 |
| Court rulings | Does not violate Fourth Amendment (Morales v. Daley, 2000); allows for gathering of statistics (United States v. 1901); "linchpin of the federal statistical system" (Dept. of Commerce v. U.S. House of Representatives, 1999) |
| Challenges | Whether it counts everyone, including non-citizens and undocumented immigrants; addition of citizenship question in 2020 |
| Response rate | 99% in 2020; expected to be lower due to COVID-19 pandemic |
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What You'll Learn

The Enumeration Clause
Article I, Section 2, Clause 3 of the US Constitution, also known as the Enumeration Clause, stipulates that the number of seats in the House of Representatives must be divided among the states according to their total populations. This count, referred to as an "actual enumeration", was to be conducted first in 1790 and then every 10 years thereafter. The Enumeration Clause guarantees a minimum of one seat per state, ensuring representation for even the smallest states.
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Apportionment of seats in the House of Representatives
The US Constitution's Enumeration Clause, or Article I, Section 2, mandates that an apportionment of representatives among the states must be carried out every 10 years. This is the original legal purpose of the decennial census. The Enumeration Clause states that the number of seats in the House of Representatives must be divided among the states according to the total population of each state. Each state is guaranteed at least one seat in the House, regardless of population size.
The apportionment process involves dividing the 435 memberships, or seats, in the House of Representatives among the 50 states. The number of seats is capped at 435 by the Reapportionment Act of 1929, except for a temporary increase to 437 when Alaska and Hawaii were admitted to the Union. The Huntington-Hill method of equal proportions has been used to distribute the seats among the states since the 1940 census reapportionment.
The Census Bureau conducts the census at 10-year intervals, with the decennial census mandated by the US Constitution. The results of the census are used to calculate the number of House seats to which each state is entitled. This process is known as apportionment and is the initial use of each census. While there is no specification on which subjects or questions are to be included in the decennial census, the Census Bureau must notify Congress of the general census subjects to be addressed three years in advance and the actual questions to be asked two years in advance.
The decennial apportionment also determines the size of each state's representation in the US Electoral College. The number of electors from each state equals the total number of House and Senate seats. Federal law requires the Clerk of the House of Representatives to notify each state government of the number of seats it is entitled to by January 25 of the year following the census. The state then determines the boundaries of congressional districts, which are geographical areas within the state of roughly equal population.
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The Census Act
The Constitution of the United States, specifically Article I, Section 2, mandates the decennial census and the subsequent apportionment of representatives among the states based on population counts. This constitutional requirement for a decennial enumeration is rooted in the political necessities of the government, marking a turning point in world history by empowering the governed over their government. The Enumeration Clause, also known as the Census Clause, guarantees each state at least one representative and ensures that political power in the House reflects comparative population size rather than wealth.
The Enumeration Clause and its interpretation have been central to these legal debates. While some argue for "distributive accuracy" over "numerical accuracy", the Supreme Court has described the census as the "linchpin of the federal statistical system", emphasising the importance of collecting data on individuals, households, and housing units. The Census Bureau employs methodologies like imputation to address uncertainties in census data, but this has also sparked controversy.
In conclusion, the Census Act, rooted in the Constitution, forms the legal foundation for the decennial census in the United States. The census has evolved to encompass more than just a headcount, reflecting the changing needs and demographics of the nation. The ongoing debates and legal challenges surrounding the census underscore its significance in shaping political representation and government decision-making.
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The Fourth Amendment
The US Constitution, in Article I, Section 2, empowers Congress to carry out a census every 10 years to determine representation in Congress based on state population counts. This is known as apportionment, which is the process of dividing the 435 memberships, or seats, in the US House of Representatives among the 50 states.
There has been debate over whether the census should count everyone, including citizens, non-citizens, and undocumented immigrants, and whether asking about immigration status would violate the constitution's equal representation clause and result in discrimination based on ethnic identity.
In 2024, there was controversy over H.R. 7109, a bill that would have required the Census Bureau to ask about citizenship and immigration status. This was seen as unconstitutional by both Republican and Democratic administrations, as it would undermine accuracy and violate the Fourteenth Amendment's requirement to apportion seats based on the number of "persons," regardless of citizenship status.
The Supreme Court has also considered whether adding a citizenship question violates the "Enumeration Clause" of Article I, Section 2. In Morales v. Daley (2000), the District Court ruled that the 2000 Census and its questions did not violate the Fourth Amendment or other constitutional provisions, as the degree of intrusion on individual privacy was limited, and the information was necessary for legitimate governmental interests.
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The Administrative Procedure Act
In the context of the census, the Administrative Procedure Act has been invoked in legal challenges surrounding the inclusion of certain questions on the census questionnaire. For example, during the Trump administration, there was controversy over the addition of a citizenship question to the 2020 census. Opponents argued that this question would lead to an undercount, particularly among households with non-citizen immigrants, as it could deter people from completing the questionnaire. Federal judges concluded that the decision to include the citizenship question lacked valid reasoning and was likely to compromise the accuracy of the census.
Moreover, the Administrative Procedure Act reinforces the constitutional mandate of the census, which is rooted in Article I, Section 2 of the U.S. Constitution. This constitutional provision requires an apportionment of representatives among the states every 10 years, based on the state population counts obtained through the decennial census. The Administrative Procedure Act, therefore, contributes to the fair and equitable distribution of political power by facilitating judicial oversight of the census process and ensuring that it aligns with constitutional requirements.
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Frequently asked questions
Article I, Section 2, Clause 3 of the US Constitution, also known as the Enumeration Clause, states that the number of seats in the House of Representatives must be divided among the states according to the total population of each state. This count was to be done first in 1790 and then every 10 years.
Article I, Section 2, Clause 3 of the US Constitution, also known as the Census Clause, mandates that an apportionment of representatives among the states must be carried out every 10 years. This is the original legal purpose of the decennial census.
Article I, Section 2 of the US Constitution specifies that a count of the entire population is to be undertaken for the purpose of legislative representation. This has been interpreted to mean that the government has the authority to collect data on its citizens.
The US Census is legally mandated by the US Constitution. It takes place every 10 years and the first census was conducted in 1790.























