When George Joseph Trowbridge was born on 20 January 1859, in Cincinnati, Hamilton, Ohio, United States, his father, George Washington Trowbridge, was 28 and his mother, Rebecca Frances Sims, was 26. He married Zoe Amy Orr on 11 July 1886. They were the parents of at least 1 son and 3 daughters. He lived in Ohio, United States in 1870 and West Chester Township, Butler, Ohio, United States in 1910. He died on 2 November 1944, in Cincinnati, Hamilton, Ohio, United States, at the age of 85, and was buried in Glendale, Le Flore, Oklahoma, United States.