When Joshua Iliff was born on 9 August 1807, in Hampshire, West Virginia, United States, his father, Stephen Iliff, was 47 and his mother, Hannah Beers, was 45. He married Eve George on 1 January 1831, in Findlay, Hancock, Ohio, United States. They were the parents of at least 2 sons and 2 daughters. He lived in Big Lick, Hancock, Ohio, United States in 1850 and Monterey Township, Allegan, Michigan, United States in 1870. He died on 6 August 1876, in Findlay, Hancock, Ohio, United States, at the age of 68.