He was married to Mattie L. Chisolm on 1 Jan 1904. William C. Thorn and Mattie L. Chisolm had the following children:
4033 i. Josephine Thorn (Private). 4034 ii. Mary E. Thorn (Private). 4035 iii. Walter J. Thorn (Private). 4036 iv. Ramonia Thorn (Private). 4037 v. Lucille Thorn was born on 5 Nov.
4038 vi. Constance Thorn was born on 12 Oct 1924. She died in 1967.