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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.
United States Senate elections, 2018. Elections to the United States Senate will be held on November 6, 2018, with 33 of the 100 seats in the Senate being contested in regular elections whose winners will serve six-year terms from January 3, 2019, until January 3, 2025. Currently, Democrats are expected to have 23 seats up for election along with 2 independents who caucus with them.