Williams County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 37,102. Its county seat is Bryan. The county was created in 1820 and later organized in 1824. It is named for David Williams, one of the captors of John André in the American Revolutionary War.

The 2008 United States presidential election in Ohio took place on November 4, 2008, which was part of the 2008 United States presidential election. Voters chose 20 representatives, or electors to the Electoral College, who voted for president and vice president.