Francis served in the 116th Ohio Volunteer Infantry during the Civil War. After the war, he married Lovina Matthews on 14 October 1865 in Porter, Gallia County, Ohio. Lovina was born 14 March 1840 in Vinton, Gallia County, Ohio to Thomas Russell Matthews and Susan Roath.
Francis and Lovina lived in Huntington Township, Gallia County, Ohio until moving to Cincinnati, Hamilton County, Ohio by 1877.
Lovina died in Cincinnati on 19 December 1883 and was buried in McGhee Cemetery in Huntington Township, Gallia County, Ohio, where her infant daughter, Lizzie, was buried.
Francis married second Melinda Knabb on 25 October 1888. Melinda was the widow of Elijah M Townsley and Jacob Markley. The marriage was apparently short lived since there is no mention of Melinda when Francis was granted his Civil War pension on 12 November 1890.
Over the years, Francis had many jobs. He was a harness and saddle maker in Gallia County. But on moving to Cincinnati, he became a butter and egg dealer, then a grocer. After 1900, he was a hackman, porter and janitor.
Francis died on 18 February 1912 in Cincinnati, Ohio. He was buried at Mount Washington Cemetery in Mount Washington, Hamilton County, Ohio.
Francis Marion Washburn and Lovina Matthews had 4 daughters:
- Mary Susan Washburn born 28 September 1866 in Vinton, Gallia County, Ohio and died 19 April 1919 in Cincinnati. She married George Elder Hillis (25 May 1857 - 31 May 1917).
- Lizzie Gertrude Washburn born 17 October 1868 and died 24 February 1869 in Vinton, Gallia County, Ohio.
- Myrtle Ione Washburn born 3 November 1872 in Huntington Township, Gallia County, Ohio and died 24 March 1951 in Cincinnati. She married Silas Barrett Waters (8 Sep 1860 - 3 Dec 1936).
- Sylvia Cynthia Washburn born 29 Jan 1878 in Cincinnati and died 29 Jun 1934 in Cincinnati. She never married.