how often are representatives to be elected
All 435 seats in the House of Representatives are up for re-election every two years during even numbered years. Members serve two-year terms. Senators serve six-year terms. Approximately one third of the Senate is up for re-election every two years.here are 535 members of Congress 100 Senators and 435 Representatives. All states have two Senators while population determines representation in the House. The Commonwealth has 9 members of the House of Representatives.