The United States House of Representatives contains 435 seats. The Constitution allocates one Congressional seat for each of the 50 states, leaving 385 seats open for apportionment calculation. Congress determines the exact calculation method; however, the United States Census always serves as the objective basis for Congressional apportionment among the 50 states.
Gains and losses, appearing in the map, refer to changes between the 2010 and 2020 apportionments. The power shift took effect starting with the 2022 election.