what determines the number of seats in the house of representatives
United States House of Representatives The only constitutional rule relating to the size of the House states: "The Number of Representatives shall not exceed one for every thirty Thousand, but each State shall have at Least one Representative."[8] Congress regularly increased the size of the House to account for population growth until it fixed the number of voting House members at 435 in 1911.[1] In 1959, upon the admission of Alaska and Hawaii, the number was temporarily increased to 437 (seating one Representative from each of those states without changing existing apportionment), and returned to 435 four years later, after the reapportionment consequent to the 1960 census.
Electoral College (United States) A state's number of electors equals the number of representatives plus two electors for both senators the state has in the United States Congress.[41][42] The number of representatives is based on the respective populations, determined every 10 years by the United States Census. Each representative represents on average 711,000 persons.[43]