Census and Apportionment: Representation, Redistricting

This guide explains the U.S. Census, apportionment, and redistricting processes, detailing their legal frameworks, methods, and implications for fair representation in the House of Representatives.


The United States Census, conducted every ten years, plays a crucial role in determining the apportionment of seats in the U.S. House of Representatives. This process, known as apportionment, ensures that representation in the House is distributed based on population data. Following apportionment, states engage in redistricting, which involves redrawing the boundaries of congressional districts to reflect population changes. This guide provides a comprehensive overview of the legal framework, processes, and implications of census, apportionment, and redistricting.

The Census

Purpose and Constitutional Basis

The U.S. Census is mandated by Article I, Section 2 of the U.S. Constitution, which requires an enumeration of the population every ten years. The primary purpose of the census is to provide accurate population data for apportionment of the House of Representatives. The census also informs the allocation of federal funds and resources to states and localities.

Conducting the Census

The U.S. Census Bureau, an agency within the Department of Commerce, is responsible for conducting the decennial census. The process involves extensive planning, data collection, and analysis to ensure an accurate count of the population. The Census Bureau employs various methods, including mail-in questionnaires, online submissions, and in-person interviews, to gather data.

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Definition and Constitutional Requirement

Apportionment refers to the process of distributing seats in the U.S. House of Representatives among the states based on population data from the census. The Constitution requires that each state receive at least one representative, with the remaining seats apportioned according to population.

Apportionment Formula

The current method of apportionment, known as the "method of equal proportions," has been in use since 1941. This formula aims to distribute seats as evenly as possible based on population, minimizing disparities in representation. The formula involves calculating a priority value for each state, which determines the order in which seats are allocated.

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The legal framework for apportionment is established by the Constitution and federal statutes. Key legal provisions include:

  • Article I, Section 2 of the U.S. Constitution: Mandates the decennial census and apportionment of House seats.
  • 14th Amendment: Requires that representatives be apportioned based on the "whole number of persons" in each state.
  • Title 13, U.S. Code: Governs the operations of the Census Bureau and the conduct of the census.

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Definition and Purpose

Redistricting is the process of redrawing the boundaries of congressional and state legislative districts to reflect population changes identified in the census. The goal is to ensure equal representation, with each district having roughly the same number of constituents.

Several legal principles guide the redistricting process:

  • Equal Population: Districts must have nearly equal populations to comply with the "one person, one vote" principle established by the Supreme Court in cases such as Wesberry v. Sanders (1964) and Reynolds v. Sims (1964).
  • Voting Rights Act of 1965: Prohibits redistricting practices that discriminate based on race or minority status.
  • Contiguity and Compactness: Districts should be contiguous (all parts connected) and compact (geographically sensible).

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Redistricting Process

The redistricting process varies by state but generally involves the following steps:

  1. Data Collection and Analysis: States receive detailed population data from the Census Bureau, which is used to inform redistricting.
  2. Drafting Plans: State legislatures or independent commissions draft redistricting plans based on legal criteria and public input.
  3. Public Hearings and Feedback: Public hearings are held to gather input and feedback on proposed redistricting plans.
  4. Approval and Implementation: Final redistricting plans are approved by the state legislature or commission and implemented for the next election cycle.

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Challenges and Controversies

Redistricting often involves significant political and legal challenges, including:

  • Gerrymandering: The practice of drawing district boundaries to favor a particular political party or group. Gerrymandering can undermine fair representation and is a frequent subject of litigation.
  • Legal Disputes: Redistricting plans are often challenged in court, with plaintiffs alleging violations of constitutional or statutory requirements.

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The processes of census, apportionment, and redistricting are fundamental to ensuring fair and equitable representation in the U.S. House of Representatives. These processes are governed by a complex legal framework designed to uphold constitutional principles and protect the rights of all citizens. Understanding the intricacies of these processes is essential for informed civic participation and the protection of democratic values.


  1. U.S. Census Bureau - About Congressional Apportionment
  2. Executive Order on Ensuring a Lawful and Accurate Enumeration
  3. U.S. Census Bureau - Congressional Apportionment
  4. 2020 Census: What is Apportionment?
  5. U.S. Constitution - Article I, Section 2
  6. 14th Amendment to the U.S. Constitution
  7. Redistricting Data Program - U.S. Census Bureau
  8. Redistricting Laws - MN House Research
  9. California Redistricting - California Secretary of State
  10. Washington State Redistricting Commission - FAQ
  11. Redistricting - The Florida Senate
  12. Districting and Apportionment Commission - Montana Legislature
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