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About one-third of the Senators in Congress are elected every two years. This means the 33 are up for election at any one time.
How often are members of Congress up for re-election? 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.