The Peoria County Board Election of 2010 determined, along with 7 members not up for re-election, the membership of the Peoria County, Illinois Board. The Democratic Party retained its majority, despite losing the popular vote. Most seats were not contested. Thomas O'Neill was re-elected as chairman by a vote of 11-7, his major opponent was Carol A Trumpe. Trumpe voted for O'Neill and was afterward elected Vice-Chairman. The former Vice-Chairman, William Prather did not seek re-election. The Board is Partisan, but does not have designated party leaders.