When Cyrus Story Chapman was born on 1 March 1818, in Rushford, Rushford, Allegany, New York, United States, his father, Eliphalet Chapman, was 39 and his mother, Dolly Eaton, was 33. He married Matilda about 1849. They were the parents of at least 1 son. He registered for military service in 1882. He died on 2 January 1900, in Jeffersonville, Clark, Indiana, United States, at the age of 81, and was buried in Eastern Cemetery, Jeffersonville Township, Clark, Indiana, United States.