Marcus married Clara Ellen Thompson on 26 May 1916 in St. Anthony, Fremont Idaho. Clara (daughter of James Medad Thompson and Polly Vilate Davis, ,) was born on 24 Aug 1895 in Wilford, Fremont Idaho; and died. [Group Sheet] [Family Chart]

1. Kenneth Clark was born on 23 Feb 1917 in Etna, Lincoln Wyoming; died on 25 Feb 1917.
2. Ronald Wayne Clark
3. Norman Lowell Clark
4. James Ernal Clark
5. Allen Edmund Clark
6. Erma Jean Clark
7. Rhea Vilate Clark was born on 22 Feb 1932 in Etna, Lincoln Wyoming; died in Mar 1934.
8. Eldon Lorain Clark was born on 18 May 1934 in Osgood, Bonneville Idaho; died in Aug 1956.
9. Living Clark
10. Living Clark