United States Senate elections, 2010
|United States Senate|
|Primary election dates, 2010|
Thirty-four of the seats are for six-year terms that begin on January 3, 2011.
Prior to the election, the Senate partisan breakdown was 58 Democrats, 40 Republicans and two independents. Of the seats up for election in 2010, 19 were held by Democrats and 18 were held by Republicans.