The 2020 census apportionment shifted 13 House seats among 13 states, with Texas gaining two seats and California losing one for the first time in its history. The count, released in April 2021 as reported by the Census Bureau, set the size of each state's House delegation and its Electoral College weight for the 2022 through 2030 elections. Those numbers still stand today, and they won't change again until the 2030 census is counted and processed.

What were the results of the 2020 census apportionment?

The 2020 census found the U.S. apportionment population to be just over 331 million people, and the Census Bureau used that number to divide the 435 House seats among the 50 states. Thirteen states saw their seat counts change, while the rest stayed the same.

Texas was the biggest winner, picking up two seats and bringing its total to 38. Five states gained one seat each: Colorado, Florida, Montana, North Carolina, and Oregon. On the losing side, seven states each gave up one seat: California, Illinois, Michigan, New York, Ohio, Pennsylvania, and West Virginia. It was the first time in California's history that it lost a House seat rather than gaining one.

The shift reflected population growth concentrated in the South and West over the previous decade, while parts of the Midwest and Northeast grew more slowly or lost residents. These changes also reset each state's number of Electoral College votes, since that total equals a state's House seats plus its two senators.

|State|Change|New total seats|

|---|---|---|

|Texas|+2|38|

|Colorado|+1|8|

|Florida|+1|28|

|Montana|+1|2|

|North Carolina|+1|14|

|Oregon|+1|6|

|California|-1|52|

|Illinois|-1|17|

|Michigan|-1|13|

|New York|-1|26|

|Ohio|-1|15|

|Pennsylvania|-1|17|

|West Virginia|-1|2|

How is apportionment calculated?

Apportionment uses a formula called the method of equal proportions, which assigns each state a priority score for every seat it could potentially receive, then hands out the 435 seats in order of highest score first. Every state automatically gets one seat no matter how small its population, since the Constitution guarantees each state at least one House member.

The process happens in clear, sequential steps, and it is run entirely by career staff at the Census Bureau using the population totals from the decennial count.

1. The Census Bureau counts every person living in the country, including noncitizens, as of April 1 of the census year.

1. The Bureau calculates the national apportionment population and removes overseas federal employees' counts for all but their home states, where applicable.

1. A priority score is calculated for each state using a mathematical formula that divides a state's population by the square root of a seat number times the next seat number.

1. All these scores, across all states, are ranked from highest to lowest.

1. Seats 51 through 435 are handed out one at a time, going down the ranked list, until all seats are assigned.

1. The Census Bureau sends the final seat counts to the President, who reports them to Congress.

This method was adopted in 1941 and has been used for every census since, replacing earlier formulas that Congress used in the 1800s and early 1900s. Because the formula rewards states with larger populations relative to seat size, a state's seat count can shift even with modest population changes if other states are growing faster or slower.

What does apportionment mean in government?

Apportionment is the process of dividing the fixed 435 House seats among the states based on their population. It happens once every 10 years, right after each census, and it determines how many representatives each state sends to Washington for the following decade.

Apportionment is different from redistricting, though the two are closely linked. Apportionment sets the number of seats a state gets; redistricting is the separate process, run by state legislatures or independent commissions, that draws the actual lines of each district inside the state. A state that gains a seat through apportionment must then redraw its maps to create a new district, while a state that loses a seat must eliminate one.

Because House seats also determine each state's share of Electoral College votes, apportionment indirectly shapes presidential elections too. A state that gains House seats gains the same number of Electoral College votes, making it more influential in future presidential races. This is one reason population shifts tracked by the census draw so much political attention long before the actual count begins.

The stakes of apportionment show up clearly at the state level once new maps are drawn, which is part of why thousands of state legislative seats are contested in election cycles that follow a new census.

What does the US Constitution say about apportionment?

The Constitution requires an actual count of the population every 10 years and says House seats must be apportioned among the states based on that count. This requirement appears in Article I, Section 2, which also established the original rule for counting population before it was changed by later amendments.

The original text counted enslaved people as three-fifths of a person for apportionment purposes, a provision eliminated by the 14th Amendment in 1868, which instead requires counting the whole number of persons in each state. The Constitution does not set a fixed number of total House seats; that cap of 435 comes from a federal law passed in 1929, not from the Constitution itself. Congress could change that number by passing a new law, though it has not done so in nearly a century.

The Constitution also guarantees that every state gets at least one representative, regardless of population, which is why small states like Montana, Wyoming, and Vermont keep a seat even though their populations are far below the average size of a congressional district. This guarantee occasionally creates representation imbalances, since the smallest states can end up with proportionally more House influence per resident than larger ones.

Who decides the final apportionment numbers?

The Census Bureau calculates the apportionment numbers, but the law gives the final announcement to the President. By federal statute, the President must deliver a statement to Congress listing each state's new number of representatives within days of receiving the Bureau's count.

Congress itself has no vote on the apportionment numbers; the formula is set by law, and the count is treated as a factual determination rather than a political decision once the Bureau finishes its calculations. Individual states can and have sued over how the census was conducted, who should be counted, or whether specific groups were undercounted, but courts have generally left the method of equal proportions itself untouched.

A notable legal fight played out ahead of the 2020 count when the Trump administration sought to exclude unauthorized immigrants from the apportionment base; the Supreme Court in Trump v. New York (2020) dismissed the challenge as premature rather than ruling on the merits, and the final 2020 apportionment ultimately counted all residents regardless of immigration status. Disputes like these show how apportionment, while mathematical in execution, remains politically sensitive at every stage.

What does the 2020 apportionment mean for Americans today?

The 2020 results are still governing representation as of November 2026, shaping which states hold more House seats, more Electoral College votes, and arguably more influence in Washington through the current midterm cycle. These numbers will not shift again until new population data from the 2030 census is finalized, expected around April 2031.

For ordinary residents, the practical effect shows up in redistricting fights, federal funding formulas that rely on census population figures, and the size of individual congressional districts. A state that gained a seat generally sees each of its districts shrink in population, giving each representative a somewhat smaller constituency, while a state that lost a seat must combine existing districts, often forcing incumbents to run against each other.

Readers should check the Census Bureau's official site for updates, since population estimates and any future legal challenges tied to the 2030 census could affect how future apportionment unfolds. Census-related litigation and funding questions remain active in Washington, as seen in recent disputes covered in coverage of courts, census issues, and federal rebates.

Frequently asked questions

When is the next census and reapportionment?

The next census takes place in 2030, with new apportionment numbers expected to be released in early 2031. Those figures will then apply to House elections and redistricting through the 2030s.

Did any states challenge the 2020 apportionment results?

Several legal challenges arose before the final count, including a Supreme Court case over whether unauthorized immigrants should be excluded from the population base. The Court dismissed that case as premature, and the final apportionment included all residents.

Why did California lose a House seat for the first time?

California's population grew more slowly than several other states during the 2010s, and under the method of equal proportions, slower relative growth can cost a state a seat even if its total population still increased. It was a historic first for a state that had gained seats in every prior census since joining the Union.

Does apportionment affect the Electoral College?

Yes. A state's Electoral College votes equal its number of House seats plus its two senators, so any state that gained House seats in 2020 also gained Electoral College votes, and any state that lost seats lost votes.

Is the 435-seat House limit permanent?

No. The 435 cap comes from a 1929 federal law, not the Constitution, so Congress could raise or lower it with new legislation. It has remained unchanged since that law passed, except for a brief temporary increase in the 1950s when Alaska and Hawaii joined the Union.