Elections for the House of Representatives of the Philippines were held on May 10, 2004. Being held together with presidential election, the party of the incumbent president Gloria Macapagal Arroyo, Lakas-Christian Muslim Democrats, and by extension the administration-led coalition, the Koalisyon ng Katapatan at Karanasan sa Kinabukasan (K4), won majority of the seats in the House of Representatives.
The elected representatives served in the 13th Congress from 2004 to 2007.
Electoral system.
The House of Representatives shall have not more than 250 members, unless otherwise fixed by law, of which 20% shall be elected via the party-list system, while the rest are elected via congressional districts. 
In this election, there are 209 seats voted via first-past-the-post in single-member districts. Each province, and a city with a population of 250,000, is guaranteed a seat, with more populous provinces and cities divided into two or more districts.
Congress has the power of redistricting three years after each census.
As there are 209 congressional districts, there shall be 52 seats available under the party-list system. A party has to cross the 2% electoral threshold to win a guaranteed seat. Next, the court ruled that the first-placed party should always have more seats than the other parties, and that the prior 2%–4%–6% method will only be used for the first-placed party. As for parties that got 2% of the vote but did not have the most votes, they will automatically have one more seat, then any extra seats will be determined via dividing their votes to the number of votes of the party with the most votes, then the quotient will be multiplied by the number of seats the party with the most votes has. The product, disregarding decimals (it is not rounded), will be the number of seats a party will get.
References.
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