The US House of Representatives is made up of 435 elected voting members from the 50 States. Each Representative in the US House represents the population residing in a single Congressional District. Congressional Districts are wholly contained divisions within a state. Each state is guaranteed a minimum of one elected representative and hence a minimum of one Congressional District. The remaining 385 Congressional districts are apportioned across the 50 States by the Federal Government by employing the Method of Equal Proportions, or in other words, based on the population of each state. Each state is responsible for drawing their Congressional District boundaries.
The US Constitution mandates that a Census of the US population take place every 10 years. The results of each decennial Census are used to reapportion Congressional Districts across the 50 states. With the completion of the 2020 decennial Census, 13 states either gained or loss seats in the House of Representatives. As a result, many states made changes to their Congressional District boundaries. The revised redistricting affects the members of the House of Representatives that will be elected this coming November and sworn into office in January 2023.