
The constitutional provisions for congressional districts in the United States are based on the requirement that each district has roughly the same population. This is derived from the Equal Protection Clause of the Fourteenth Amendment, which states that Representatives shall be apportioned among the several States according to their respective numbers. Each state is guaranteed at least one seat in the House, and the maximum number of seats is currently capped at 435. The process of apportionment is based on the decennial census, with each state responsible for establishing its own congressional districts. The Supreme Court has played a role in defining these requirements, with cases such as Wesberry v. Sanders and Kirkpatrick v. Preisler shaping the interpretation of the Constitution's provisions.
| Characteristics | Values |
|---|---|
| Number of voting representatives | 435 |
| Number of delegates to the House of Representatives | 5 |
| Average citizens per congressional district in 1790 | 33,000 |
| Average citizens per congressional district in 2018 | 700,000 |
| States with populations smaller than the average for a single district | Wyoming and Vermont |
| Constitutional requirement | Each district should have roughly the same population |
| Redistricting rule | Contiguity |
| Number of states requiring congressional districts to be contiguous | 18 |
| States with no changes in congressional districts for the 117th Congress | All except North Carolina |
| States with single-member districts | Alaska, Delaware, North Dakota, South Dakota, Vermont, and Wyoming |
| States requiring congressional districts to follow political boundaries | 15 |
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What You'll Learn

Equal representation
The United States Constitution requires that each district has roughly the same population. This means that each federal district within a state must have about the same number of people, and the same applies to state districts and local districts within their jurisdiction. This is known as the "one person, one vote" principle, which aims for equality in voting power.
The number of voting representatives in the U.S. House of Representatives is currently set at 435, with an additional five delegates representing Washington D.C. and various territories. Each state is guaranteed at least one seat in the House, and the number of seats is determined by the state's population. The Reapportionment Act of 1929 capped the number of seats at 435, except for a temporary increase to 437 when Alaska and Hawaii became states.
The process of redrawing congressional district boundaries is called redistricting. While the federal government has some oversight, the specifics are largely determined by the states themselves. The Constitution requires states to make a good-faith effort to draw districts with roughly equal populations, and any deviations must be justified by a consistent state policy. This has been interpreted by the Supreme Court as requiring "precise mathematical equality" in district populations.
The most common state rule in redistricting is a requirement to follow political boundaries, such as county, city, or town lines. 34 states require state legislative districts to account for these boundaries, and 15 states impose similar constraints on congressional districts. However, this rule must bend to federal equal population requirements and Voting Rights Act constraints.
The issue of equal representation in congressional districts has been a topic of legal debate, with cases such as Wesberry v. Sanders and Kirkpatrick v. Preisler shaping the interpretation of the Constitution's equal protection clause. The Supreme Court has also addressed partisan gerrymandering, with cases like Davis v. Bandemer and Rucho v. Common Cause impacting the justiciability of these claims.
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Redistricting
The process of redistricting is necessary to ensure that each district has roughly the same population, in accordance with the Equal Protection Clause of the Fourteenth Amendment. This requirement was established in Wesberry v. Sanders, where the Court held that "one man's vote in a congressional election is to be worth as much as another's." In other words, each federal district within a state, each state district within a state, and each local district within its jurisdiction must have roughly the same number of people.
States have some flexibility in how they draw district boundaries, but they must make a good-faith effort to ensure that each district has roughly the same population. Small deviations are allowed when they serve legitimate objectives, such as keeping county lines intact. For example, in 2012, the Supreme Court approved a congressional plan in West Virginia with a 0.79% population variation to keep county lines intact.
The most common rule imposed by the states is contiguity, which requires that all portions of a district be physically adjacent. 45 states require at least one chamber's state legislative districts to be contiguous, and 18 states have similar requirements for their congressional districts. The second most common state rule is a requirement to follow political boundaries, such as county, city, town, or ward lines when drawing districts. 34 states require state legislative districts to account for political boundaries, and 15 states impose similar constraints on congressional districts.
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Gerrymandering
The process of gerrymandering typically occurs when one party controls the state's legislative bodies and the governor's office. This allows them to redraw district maps to their advantage and dilute the voting power of their political opponents. Advances in technology, such as detailed maps and high-speed computing, have made gerrymandering more precise and effective. By using geographic information systems and census data, mapmakers can create numerous potential map configurations to achieve their desired outcomes.
There are two main techniques used in gerrymandering: cracking and packing. Cracking involves splitting groups of voters with similar characteristics, such as party affiliation, across multiple districts to dilute their voting power. Packing, on the other hand, concentrates voters in a single district, reducing the opposition's congressional representation. These techniques can result in oddly shaped districts, but they can also produce regular-looking districts that still heavily favour one party.
Despite the challenges posed by gerrymandering, there have been efforts to create non-partisan districting plans. Simulations have been used to evaluate partisan gerrymandering cases in court and compare alternative mapping plans. Ultimately, gerrymandering undermines the democratic process by reducing electoral competitiveness and making voters feel like their votes do not matter.
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Qualifications of electors
The determination of qualifications for electors in congressional elections was originally left to the discretion of the states, except for the express requirement that the states could not prescribe any qualifications other than those tied to age, citizenship, and residence.
The Fourteenth Amendment's Equal Protection Clause has been interpreted to require that election districts in each state be structured so that each elected representative represents substantially equal populations. This means that each federal district within a state, each state district within a state, and each local district within its jurisdiction must have roughly the same number of people. States must make a good-faith effort to draw districts with the same number of people, and any deviations must be justified by a consistent state policy. The Supreme Court has held that relatively small deviations from equality are permissible when they serve legitimate objectives, such as keeping county lines intact.
The Supreme Court has also addressed the issue of partisan gerrymandering, holding in Davis v. Bandemer that such claims were justiciable. However, the Court later held in Rucho v. Common Cause that claims of unconstitutional partisan gerrymandering were nonjusticiable due to the lack of a "constitutional directive" and "legal standards to guide" the Court.
The number of voting representatives in the U.S. House of Representatives is currently set at 435, with an additional five delegates representing the District of Columbia and various territories. Each state is guaranteed at least one representative, regardless of population size. The process of determining how many representatives each state receives is known as apportionment and is based on the decennial census population counts.
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State representation
The United States Constitution, specifically Article I, Section 2, provides the foundation for the establishment and representation of congressional districts. The Constitution guarantees each state representation in the House of Representatives, which is the lower chamber of the US Congress. The size of the House is currently set at 435 voting members, with seats apportioned among the states based on population data from the decennial census. This process of apportionment determines how many representatives each state will have and forms the basis for creating congressional districts.
Article I, Section 2 of the Constitution, commonly referred to as the "Congressional Apportionment Clause," states that "The Number of Representatives shall not exceed one for every thirty Thousand, but each State shall have at Least one Representative." The clause further provides that "the 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." This clause establishes the basis for reapportioning seats in the House of Representatives and redistrict every ten years following the census.
The concept of equal representation is a key principle in state representation in the House. The Constitution aims to ensure that each representative in the House has roughly an equal number of constituents. This is known as the principle of "one person, one vote," which was established by the Supreme Court in the case of Wesberry v. Sanders (1964). The Court ruled that congressional districts must be apportioned in a way that ensures that each person's vote carries roughly equal weight. This ruling has had a significant impact on the creation of congressional districts, requiring them to have roughly equal populations.
In addition to the apportionment of seats, the Constitution also provides for fractional representation. This means that states that do not have a population large enough to warrant an additional full seat will still receive partial representation. This ensures that smaller states are not completely disregarded in the House and have some representation proportional to their population. The calculation for apportionment is based on a method called the "method of equal proportions," which was adopted by Congress in 1941.
Another important aspect of state representation is the guarantee of a republican form of government. The Guarantee Clause in Article IV, Section 4, of the Constitution ensures that each state maintains a republican form of government, which includes representative principles. This clause has been interpreted to mean that states must have a certain level of democratic representation and that congressional districts should be drawn to ensure fair and effective representation for all citizens.
Finally, it is worth noting that while the Constitution provides the framework for state representation in the House of Representatives, the specific processes and rules for creating congressional districts vary from state to state. Each state has its own unique set of laws, guidelines, and procedures for drawing district lines, which are typically handled by state legislatures and, in some cases, independent commissions. These processes are subject to various legal requirements, including compliance with the Voting Rights Act of 1965, which prohibits discriminatory practices in voting, and other federal and state constitutional provisions.
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Frequently asked questions
Congressional districting is the process of dividing the land area of the United States into congressional districts, from which members are elected to the U.S. House of Representatives.
The U.S. Constitution requires that each district has roughly the same population. This means that each federal district within a state, each state district within that state, and each local district within its jurisdiction must have about the same number of people. The standard for congressional districts allows for small deviations when serving legitimate objectives.
Congressional districts are determined through a process called redistricting, which is based on decennial census population counts. Each state with multiple seats is responsible for establishing its own congressional districts for electing representatives.

























