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Sources:
"STATISTICS OF THE PRESIDENTIAL AND CONGRESSIONAL ELECTION OF NOVEMBER 5, 2024", hereafter called "2024 Election Statistics", compiled by the Office of the Clerk, US House of Representatives, and published on March 10, 2025.

MIT Election Data and Science Lab. 2017. “U.S. House 1976–2024.” Harvard Dataverse. https://doi.org/10.7910/DVN/IG0UN2.

The US Census Bureau is the source for the cartographic boundaries of districts.

Notes:
The "Republican Margin" metric is calculated for most districts and is derived from subtracting the Democratic percentage of total votes cast from the Republican percentage of total votes cast. Thus a positive "Republican Margin" for a district means that the Republican candidate won and the district is colored red on the map. Conversely, a negative "Republican Margin" would result in a blue colored district to depict Democratic candidate victory. The color will also reflect the changed margin. The tally of shown on the US House Districts won in the 2024 election and the associated votes received by each party will also change in response to this margin shift.

To that effect, districts on the map will change their color depending on the margin changes resulting from inputs to the margin change form. The tallies on the US House Seats won in the 2024 election by Democrats and Republicans and also the total vote count for each party. These tallies are also adjusted based on inputs to the form.

The form for changing the Republican Margin can take a positive or negative number (the form is configured to provide outputs for numbers between and including -80 to 80) as an input. The map can be adjusted to view Hawaii, Alaska, or specific districts.

Since Alaska in 2024 required that the winning candidate get a majority of the vote, ranked-choice was used to eliminate some candidates. In the case of Alaska (AT LARGE) the data reported in the "2024 Election Statistics" is before the ranked-choice was applied and it shows a positive margin for the Republican candidate. Even though the candidate declared the winner after the application of ranked-choice was the same as what is shown in "2024 Election Statistics" the vote tally was different. However, "2024 Election Statistics" is being used here for the calculation of the "Republican Margin" and the total Democratic and total Republican vote tallies, consistent with how such totals are calculated in "2024 Election Statistics". In the case of this seat, if the "Republican Margin" is made negative, the district turns blue and is counted as a Democratic seat. In practice such a change in Republican Margin, ranked-choice voting may lead to a different result.

Maine US House districts in 2024 also required the winning candidate to secure a majority of the vote. In the case of Maine District 1, the Democratic Party candidate won over 50% of the vote and thus ranked-choice voting was not applied. In the case of this seat, the "Republican Margin" was negative and if it is turned positive, the district will turn red and will be counted as a Republican seat. In practice such a change in Republican Margin, however, ranked-choice voting may lead to a different result. In the case of Maine District 2, the "2024 Election Statistics" report provides vote tallies for candidates after ranked-choice voting has been applied and the post ranked-choice tallies are being used for the calculation of total Democratic and total Republican votes, consistent with how such totals are calculated in "2024 Election Statistics". In the case of Maine District 2, because the results as reported are after ranked-choice voting has been applied, no "Republican Margin" is being calculated and thus any changes to such margin will have no effect on the data for this seat.

In the case of Minnesota, the votes for the "Democratic-Farmer-Labor" party, which in 2024 was allied with the Democratic Party in Minnesota, are counted as votes for the Democratic Party in the case of individual vote districts and their "Republican Margin" and also in terms of the national vote tallies for the Democratic party.

In the case of North Dakota, the votes for the "Democratic-Nonpartisan League" party, which in 2024 was allied with the Democratic party in North Dakota, are counted as votes for the Democratic Party in the case of the "At Large" North Dakota House district and its "Republican Margin" and also in terms of the national vote tally for the Democratic party.

California and Washington in 2024 had a top two primary system for US House seats whereby the top two candidates in the primary election--irrespective of whether they are from the same party--would advance to the general election. Thus some districts in California or Washington had two Republicans or two Democrats. In such cases, no "Republican Margin" was calculated for those seats and changing the margin will have no effect on the votes in those districts or in national vote tallies.

Georgia in 2024 required winners of house seats to gain a majority of votes cast and if this were not acheived in the November 5, 2024 election, there would be a runoff between the top two vote receivers from November 5, 2024. In the November 5, 2024 election each of the winners received a majority of the vote thus negating the need for a run-off. Each of the districts in Georgia on the map has a "Republican Margin" associated with it and changes to it can change the winner of the seat on the map and since each district in 2024 only had two candidates the winning candidate would receive a majority.

Louisiana for the November 2024 US House elections allowed multiple candidates from the same party to run for a House seat and if no candidate received a majority of the total vote the top two candidates could go into a runoff. Thus such an election has characteristics of both a primary election and a general election and thus is commonly referred to as a "jungle primary". A runoff could involve two candidates from the same party. However, in 2024 no runoff was needed since the winning candidate obtained a majority of the vote in each House district. The "Republican Votes" and "Democratic Votes" shown for each Louisiana House District shows the aggregate votes for all candidates from that party for a specific house seat. Furthermore, a shift in "Republican Margin" shifts votes from the aggregate "Democratic Votes" to aggregate "Republican Votes" or vice versa and the Party with the most aggregate votes is shown as winning the district. Red coloring indicates Republican win while blue coloring indicates Democratic win. In practice, shifts in votes from one party to another could be moved from or accrue to a specific candidate of multiple candidates from a Party. The approach focused on aggregates is a considered choice and the Louisiana 2024 House election results show that winning candidates were in all cases from the Party that received the largest aggregate votes, suggesting that focusing on the aggregate winner is a useful indicator as to which party will win the seat.

Districts which do not have both a Republican and Democratic Party or Democratic Party allied party candidate do not have a "Republican Margin" calculated.

In the case of New York and Connecticut, if a Democratic or Republican candidate is on the ballot as a candidate for multiple parties, the votes displayed for such candidates and the calculation of the "Republican Margin" only count votes received as a Democratic or Republican candidate. There was no instance in 2024 in these states whereby the same candidate received votes as both a Democratic and Republican candidate.

In the case of Vermont, for the "At Large" district, no Republican candidate has been noted since the main non Democratic Party candidate is noted in "2024 Election Statistics" as a "Republican, Libertarian".

Data on the non-voting seats of the House of Representatives is not being tallied or used and such items are excluded from the map.

Rounding of some numbers means that shifts in the "Republican Margin" may not precisely convey into the number of votes shifted from one party to another--this is primarily so as to prevent allocating fractions of one vote to multiple parties.

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