The House of Representatives has 435 members based on state population. To be a representative, one must be at least 25 years old, a US citizen for at least 7 years, and a resident of the state they represent. Representatives serve 2-year terms and are re-elected in November of even-numbered years. After each census, seats are reapportioned among states based on population changes, and districts are redrawn, which can result in gerrymandering that gives one party an unfair advantage.