William McMillan served as a Representative from Ohio in the United States Congress from 1799 to 1801. A member of the Unknown Party, William McMillan contributed to the legislative process during 1 term in office.

William McMillan’s service in Congress occurred during a significant period in American history. As a member of the House of Representatives, William McMillan participated in the democratic process and represented the interests of constituents, helping to shape the laws and policies that governed the nation.