58-694: The Cook Partisan Voting Index , abbreviated PVI or CPVI, is a measurement of how partisan a U.S. congressional district or U.S. state is. This partisanship is indicated as lean towards either the Republican Party or the Democratic Party , compared to the nation as a whole, based on how that district or state voted in the previous two presidential elections. The Partisan Voting Index was developed in 1997 by Charlie Cook of The Cook Political Report , in conjunction with Clark Bensen and his political statistical analysis firm, Polidata, "as
116-588: A better depositary. And if we carry on the supposition to six or seven thousand, the whole reasoning ought to be reversed. ... In all very numerous assemblies, of whatever character composed, passion never fails to wrest the scepter from reason. When talking about the populations within California's reapportioned House districts in 1951, a report from Duke University found that "[there] is not an excessive disparity in district populations, but [the populations and disparities are] perhaps larger than necessary." If
174-589: A means of providing a more accurate picture of the competitiveness". It is based on the methodology introduced by Rob Richie of the Center for Voting and Democracy for the Center's July 1997 Monopoly Politics report. The Cook Political Report has since released new PVI scores every two years. In 2021, the newsletter ended its relationship with Polidata and instead used Dave Leip's Atlas of U.S. Presidential Elections to calculate 2020's results. The most recent iteration
232-473: A more than 1,600-member House following the same 2010 census. One proposal to alleviate the current constituency disparities and the high average number of constituents in many states' congressional districts is the " Wyoming rule ." Operating similar to New Zealand's method of allocation for proportional representation, it would give the least populous state (which has been Wyoming since 1990 ) one representative and then create districts in other states with
290-424: A permanent elevation of the few on the depression of the many; ... Madison also addressed Anti-Federalist claims that the representation would be inadequate, arguing that the major inadequacies are of minimal inconvenience since these will be cured rather quickly by virtue of decennial reapportionment. He noted, however, I take for granted here what I shall, in answering the fourth objection, hereinafter show, that
348-600: A single district, although neither state has fewer people than the least populous congressional districts. Among the Bill of Rights amendments to the United States Constitution proposed by Congress in 1789, was one addressing the number of seats in the House . It attempted to set a pattern for growth of the House along with the population, but has not been ratified. After the first enumeration required by
406-491: A state in 1820. See District of Maine . The list includes the 435 voting districts of the 119th United States Congress , effective from 2025 to 2027. [REDACTED] [REDACTED] United States congressional apportionment United States congressional apportionment is the process by which seats in the United States House of Representatives are distributed among the 50 states according to
464-478: A state is assigned a seat, n is incremented by 1, causing its priority value to be reduced and reordered among the states, whereupon another state normally rises to the top of the list. The 2010 census ranking of priority values shows the order in which seats 51–435 were apportioned after the 2010 census, with additional listings for the next five priorities. Minnesota was allocated the final (435th) seat. North Carolina missed its 14th seat by 15,754 residents as
522-689: A word not used in the Constitution until the Thirteenth Amendment . Following the end of the Civil War , the first of those provisions was superseded by Section 2 of the Fourteenth Amendment : Representatives shall be apportioned among the several States according to their respective numbers, counting the whole number of persons in each State, excluding Indians not taxed. But when the right to vote at any election for
580-407: Is the 2022 Cook Partisan Voting Index, which was released with an updated formula for calculating PVI values. The index looks at how every congressional district voted in the past two presidential elections combined and compares it to the national average. The Cook PVI is displayed as a letter, a plus sign, and a number, with the letter (either a D for Democratic or an R for Republican ) indicating
638-410: Is the method of equal proportions, which minimizes the percentage differences in the number of people per representative among the different states. The resulting apportionment is optimal in the sense that any additional transfer of a seat from one state to another would result in larger percentage differences. In this method, as a first step, each of the 50 states is given its one guaranteed seat in
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#1732771746271696-461: Is the responsibility of state governments, who often gerrymander districts for various reasons. Districts may sometimes retain the same boundaries, while changing their district numbers. The following is a complete list of the 435 current congressional districts for the House of Representatives, and over 200 obsolete districts, and the six current and one obsolete non-voting delegations. See Non-voting delegations , below. The oldest district in
754-448: Is the third-largest in the world; legislatures typically grow in proportion to the cube root of the population , rather than linearly, meaning larger countries tend to have larger constituency sizes. The Apportionment Act of 1911 ( Public Law 62-5 ) raised the membership of the U.S. House to 433 and provided for an apportionment. It also provided for additional seats upon the admissions of Arizona and New Mexico as states, increasing
812-515: The 110th Congress , Representative Tom Davis introduced a bill in the House of Representatives that would add two seats to the House, one for Utah and one for the District of Columbia . It was passed by the House, but was tripped up by procedural hurdles in the Senate and withdrawn from consideration. An identical bill was reintroduced during the 110th Congress . In February 2009 the Senate adopted
870-430: The 2020 United States census . Each state is responsible for the redistricting of districts within their state, while several states have one "at-large" division. Redistricting must take place if the number of members changes following a re-apportionment, or may take place at any other time if demographics represented in a district have changed substantially. Setting the boundaries of states' congressional districts
928-475: The Clerk of the House of Representatives to notify each state government no later than January 25 of the year immediately following the census of the number of seats to which it is entitled. Whether or not the number of seats has changed, the state determines the boundaries of congressional districts —geographical areas within the state of approximately equal population—in a process called redistricting . Because
986-599: The Reapportionment Act of 1929 —except for a temporary (1959–1962) increase to 437 when Alaska and Hawaii were admitted into the Union . The Huntington–Hill method of equal proportions has been used to distribute the seats among the states since the 1940 census reapportionment. Federal law requires the clerk of the United States House of Representatives to notify each state government of
1044-673: The United States Constitution initially provided: 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 Number of Representatives shall not exceed one for every thirty Thousand, but each State shall have at least one Representative;… The phrase "all other persons" refers to slaves,
1102-502: The federal district of Washington, D. C. , sends a non-voting delegate to the House of Representatives. The Bureau of the Census conducts a constitutionally mandated decennial census whose figures are used to determine the number of congressional districts to which each state is entitled, in a process called " apportionment ". The 2022 elections were the first to be based on the congressional districts which were defined based on
1160-428: The m th allocation, n = m -1). Consider the reapportionment following the 2010 U.S. census: beginning with all states initially being allocated one seat, the largest value of A 1 corresponds to the largest state, California, which is allocated seat 51. After being allocated its 2nd seat, its priority value decreases to its A 2 value, which is reordered to a position back in line. The 52nd seat goes to Texas,
1218-492: The 20th century, the number of representatives increased every decade as more states joined the union, and the population increased. Elections are held the preceding year The ideal number of members has been a contentious issue since the country's founding. George Washington agreed that the original representation proposed during the Constitutional Convention (one representative for every 40,000)
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#17327717462711276-439: The 2nd largest state, because its A 1 priority value is larger than the A n of any other state. However, the 53rd seat goes back to California because its A 2 priority value is larger than the A n of any other state. The 54th seat goes to New York because its A 1 priority value is larger than the A n of any other state at this point. This process continues until all remaining seats are assigned. Each time
1334-529: The 436th seat to be allocated; ten years earlier it had gained its 13th seat as the 435th seat to be allocated based on the 2000 census. The 2020 census ranking of priority values shows the order in which seats 51–435 were apportioned after the 2020 census, with additional listings for the next ten priorities. For the second time in a row, Minnesota was allocated the final (435th) seat. If either New York had registered 89 more residents or Minnesota had registered 26 fewer residents, New York would have been allocated
1392-480: The House had a similar ratio of representatives to constituents as it did after the 1930 United States census , it would currently have 1,156 members (still just the second largest lower house, after China ). The United States has unusually large constituencies compared to other OECD countries, the third largest in the world. However, most of this is caused by the United States's large population, which
1450-725: The House of Representatives . They represent the District of Columbia and the territories of American Samoa , Guam , the Northern Mariana Islands , which first elected a representative in 2008, and the U.S. Virgin Islands . Puerto Rico also elects a resident commissioner every four years. Since 1789, when the United States Congress first convened under the Constitution, the number of citizens per congressional district has risen from an average of 33,000 in 1790 to over 700,000 as of 2018 . Prior to
1508-436: The House of Representatives is currently set at 435, with each one representing an average of 761,169 people following the 2020 United States census . The number of voting seats has applied since 1913, excluding a temporary increase to 437 after the admissions of Alaska and Hawaii . The total number of state members is capped by the Reapportionment Act of 1929 . In addition, each of the five inhabited U.S. territories and
1566-421: The House of Representatives, leaving 385 seats to assign. The remaining seats are allocated one at a time, to the state with the highest priority number. Thus, the 51st seat would go to the most populous state (currently California). The priority number is determined by the ratio of the state population to the geometric mean of the number of seats it currently holds in the assignment process, n (initially 1), and
1624-584: The Webster method, which was used following the 1910 and 1930 censuses (no reapportionment was done after the 1920 census). The current method, known as the Huntington–Hill method or method of equal proportions, was adopted in 1941 for reapportionment based on the 1940 census and beyond. The revised method was necessary in the context of the cap on the number of representatives set in the Reapportionment Act of 1929 . The apportionment method currently used
1682-468: The amendment may have instead outlined an iterative procedure for apportionment following a square root rule relative to the population (e.g. R e p r e s e n t a t i v e s ≈ 10000 + P o p u l a t i o n / 100 − 100 {\textstyle Representatives\approx {\sqrt {10000+Population/100}}-100} ) that would still have called for
1740-627: The choice of electors for President and Vice-President of the United States, Representatives in Congress, the Executive and Judicial officers of a State, or the members of the Legislature thereof, is denied to any of the male inhabitants of such State, being twenty-one years of age, and citizens of the United States, or in any way abridged, except for participation in rebellion, or other crime, the basis of representation therein shall be reduced in
1798-491: The country, it has never changed its shape or size. From 1813 to 1823, Delaware had two representatives — both chosen at-large on a general ticket from the same statewide district. See Non-voting delegations , below. See Non-voting delegations , below. Until 1820, Maine was part of Massachusetts. After the 1810 census , Massachusetts was allocated 20 districts. Seven Massachusetts districts (then numbered 14 through 20 ) were credited to Maine soon after it became
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1856-480: The deadline for the House Clerk to report the results does not occur until the following January, and the states need sufficient time to perform the redistricting, the decennial census does not affect the elections that are held during that same year. For example, the electoral college apportionment and congressional races during the 2020 presidential election year were still based on the 2010 census results; all of
1914-414: The first article of the Constitution, there shall be one Representative for every thirty thousand, until the number shall amount to one hundred, after which the proportion shall be so regulated by Congress, that there shall be not less than one hundred Representatives, nor less than one Representative for every forty thousand persons, until the number of Representatives shall amount to two hundred; after which
1972-559: The measure 61–37. In April 2010, however, House leaders decided to shelve the proposal. Two provisions of Section 102, subsection (d) in the Washington, D.C., Admission Act by delegate Eleanor Holmes Norton and its same-titled Senate companion by Sen. Tom Carper , both introduced in 2021 and again in 2023 during the 117th and 118th Congresses , seek to amend Section 22(a) of the Reapportionment Act by adding one to
2030-422: The method of apportionment to be carried into force at that time are enacted prior to the census. The decennial apportionment also determines the size of each state's representation in the U.S. Electoral College . Under Article II, Section 1, Clause 2 of the U.S. Constitution, the number of electors of any state equals the size of its total congressional delegation (House and Senate seats). Federal law requires
2088-576: The most recent decennial census mandated by the United States Constitution . After each state is assigned one seat in the House, most states are then apportioned a number of additional seats which roughly corresponds to its share of the aggregate population of the 50 states. Every state is constitutionally guaranteed two seats in the Senate and at least one seat in the House, regardless of population. The U.S. House of Representatives' maximum number of seats has been limited to 435, capped at that number by
2146-505: The newly redrawn districts based on the 2020 census did not finally come into force until the 2022 midterm election winners were inaugurated in January 2023. The size of the U.S. House of Representatives refers to the total number of congressional districts (or seats) into which the land area of the United States proper has been divided. The number of voting representatives is currently set at 435 . There are an additional five delegates to
2204-466: The next cube; in this case, the next House member would be added when the census population reached 331,373,889, and the one after that at 332,812,558. A variation would split the representation between the House and the Senate, e.g. 592 members in the House (692 − 100 senators). On May 21, 2001, Rep. Alcee Hastings sent a dear colleague letter pointing out that U.S. expansion of its legislature had not kept pace with other countries. In 2007, during
2262-659: The number of representatives in each state is in principle to be proportional to its population. Since the adoption of the Constitution , five distinct apportionment methods have been used. The first apportionment was contained in Art. I, § 2, cl. 3 of the Constitution . After the first census in 1790, Congress passed the Apportionment Act of 1792 and adopted the Jefferson method to apportion U.S. representatives to
2320-432: The number of representatives will be augmented from time to time in the manner provided by the Constitution. On a contrary supposition, I should admit the objection to have very great weight indeed. Madison argued against the assumption that more is better: Sixty or seventy men may be more properly trusted with a given degree of power than six or seven. But it does not follow that six or seven hundred would be proportionally
2378-416: The number of seats apportioned to the state no later than January 25 of the year immediately following each decennial census . The size of a state's total congressional delegation (which in addition to representative(s) includes 2 senators for each state) also determines the size of its representation in the U.S. Electoral College , which elects the U.S. president . Article One , Section 2, Clause 3 of
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2436-416: The number of seats it would hold if the seat were assigned to it, n +1. Symbolically, the priority number A n is where P is the population of the state, and n is the number of seats it currently holds before the possible allocation of the next seat. An equivalent, recursive definition is where n is still the number of seats the state has before allocation of the next (in other words, for
2494-418: The number to 435 in 1912. In 1921, Congress failed to reapportion the House membership as required by the United States Constitution. This failure to reapportion may have been politically motivated, as the newly elected Republican majority may have feared the effect such a reapportionment would have on their future electoral prospects. A reapportionment in 1921 in the traditional fashion would have increased
2552-419: The party that outperformed in the district and the number showing how many percentage points above the national average it received. In 2022, the formula was updated to weigh the most recent presidential election more heavily than the prior election. The PVIs for congressional districts are calculated based on the 2016 and 2020 presidential elections. With a PVI of R+1, Michigan's 8th congressional district
2610-417: The permanent House membership for a total of 436 representatives as the state of Washington, Douglass Commonwealth (i.e., Washington, D.C.) would have been entitled to an at-large district. Holmes Norton's bill previously passed the House during the 116th Congress but not the Senate. Apart from the requirement that each state is to be entitled to at least one representative in the House of Representatives,
2668-414: The presidency) passed the Reapportionment Act of 1929 which capped the size of the House at 435 and established a permanent method for apportioning a constant 435 seats. This cap has remained unchanged since then, except for a temporary increase to 437 members upon the 1959 admission of Alaska and Hawaii into the Union. Two states, Wyoming and Vermont , have populations smaller than the average for
2726-431: The proportion shall be so regulated by Congress, that there shall not be less than two hundred Representatives, nor more than one Representative for every fifty thousand persons. Taken at face-value, with the nation's population reaching approximately 308.7 million according to the 2010 census , the proposed amendment would have called for an up-to 6,000-member House. However, in the context of its original construction,
2784-430: The proportion which the number of such male citizens shall bear to the whole number of male citizens twenty-one years of age in such State. The phrase "counting the whole number of persons in each State" has traditionally been understood to include non-citizens for purposes of apportionment. Reapportionments normally occur following each decennial census, though the law that governs the total number of representatives and
2842-418: The public trust and interests. ... first, that so small a number of representatives will be an unsafe depositary of the public interests; secondly, that they will not possess a proper knowledge of the local circumstances of their numerous constituents; thirdly, that they will be taken from that class of citizens which will sympathize least with the feelings of the mass of the people, and be most likely to aim at
2900-454: The quota. In Federalist No. 55 , James Madison argued that the size of the House of Representatives has to balance the ability of the body to legislate with the need for legislators to have a relationship close enough to the people to understand their local circumstances, that such representatives' social class be low enough to sympathize with the feelings of the mass of the people, and that their power be diluted enough to limit their abuse of
2958-480: The results of the U.S. presidential elections in 2016 and 2020 . The table below reflects the state of Congress and governors, based on the 2022 election results. List of United States congressional districts Congressional districts in the United States are electoral divisions for the purpose of electing members of the United States House of Representatives . The number of voting seats within
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#17327717462713016-402: The same population. Another proposed expansion rule, the cube root rule , calls for the membership of the legislature to be based on the cube root (rounded up) of the U.S. population at the last census. For example, such a rule would call for 692 members of the House based on the 2020 United States census. An additional House member would be added each time the national population exceeds
3074-441: The situation was substantially less clear. Congress passed a law in 1850 declaring future apportionment would be done with Hamilton's method . However, Congress continued to pass ad hoc apportionment bills from 1850 through 1900, in each case overruling the procedure laid out in the 1850 census. This was particularly true after the 1860 Census: the national situation was complicated by the Civil War ), and no real apportionment method
3132-500: The size of the House to 483 seats , but many members would have lost their seats due to the population shifts, and the House chamber did not have adequate seats for 483 members. By 1929, no reapportionment had been made since 1911, and there was vast representational inequity, measured by the average district size. By 1929 some states had districts twice as large as others due to population growth and demographic shift. In 1929 Congress (with Republican control of both houses of Congress and
3190-420: The states based on population. The Jefferson method required fractional remainders to be discarded when calculating each state's total number of U.S. representatives and was used until the 1830 census. The Webster method , proposed in 1832 by Daniel Webster and adopted for the 1840 census, allocated an additional representative to states with a fractional remainder greater than 0.5. From 1850 to 1900,
3248-456: Was determined to be the median congressional district, meaning that exactly 217 districts are more Democratic and 217 are more Republican than this district. As of 2022, there are 222 districts in the House that are more Republican than the national average and 206 districts more Democratic than the national average. The number of swing seats , defined as those between D+5 and R+5, is 87. representative The PVIs for states are calculated based on
3306-420: Was inadequate and supported an alteration to reduce that number to 30,000. This was the only time that Washington pronounced an opinion on any of the actual issues debated during the entire convention. Five years later, Washington was so insistent on having no more than 30,000 constituents per representative that he exercised the first presidential veto in history on a bill which allowed half states to go over
3364-485: Was used. Apart from 1860, Congress deliberately chose after each census to set the size of the House at a level where Hamilton and Webster's methods gave the same apportionment. This unofficial adoption of Webster's method was driven by the discovery of the Alabama paradox , which created an uproar in the House. The Apportionment Act of 1911 , in addition to setting the number of U.S. representatives at 435, returned to
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