When William Wirt Peabody was born on 26 October 1838, in Gorham, Cumberland, Maine, United States, his father, William Henry Peabody, was 37 and his mother, Hannah March, was 33. He married Sarah Elizabeth Ferree on 2 July 1861, in Chillicothe, Ross, Ohio, United States. They were the parents of at least 2 sons and 2 daughters. He lived in Columbia Township, Hamilton, Ohio, United States in 1900 and Columbia, Columbia Township, Hamilton, Ohio, United States in 1910. He died on 14 October 1910, in Madisonville, Columbia Township, Hamilton, Ohio, United States, at the age of 71, and was buried in Ohio, United States.