William Muldoon was born in the village of Belfast, New York, in 1845 and joined the Union Army in 1861 to fight in the Civil War.
He was wounded at the Battle of Antietam and was discharged in 1864. He returned to the village of Belfast and married Mary Ann McGuire in 1866. He was a farmer and a member of the Methodist Church. He died in Belfast in 1918.

William Muldoon was born in the village of