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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.
34 U.S. Senate seats to be contested in 2016. The current U.S. Senate has 54 Republicans and 45 Democrats (including one independent). The 2016 Senate election takes place on November 8, 2016. There are 34 seats up in 2016, of which 24 are held by Republicans. Democrats will need to gain 4 or 5 seats to take control. This 3-part Senate map lets you view the current Senate, make a forecast for the 2016 Senate elections, and see the composition of the 2017 Senate based on those predictions.