William married Mary Tresella Wirth on 20 Feb 1906 in Iowa, USA. Mary (daughter of Friedrich Wirth and Louisa Baldus) was born on 5 Nov 1882 in Story County, Iowa, USA; died on 18 Jul 1965 in Brown County, Minnesota, USA. [Group Sheet] [Family Chart]

1. Louise Rose Monson was born on 15 Jan 1907 in Dubuque, Dubuque County, Iowa, USA; died on 7 Jun 2001 in Alexandria, Douglas County, Minnesota, USA.
2. Albert Richard Monson was born on 30 Jan 1909 in North Dakota, USA; died on 18 Jun 1970 in California, USA.
3. Christine Tresella Monson was born on 6 Nov 1910 in North Dakota, USA; died on 14 Jan 1998 in Minnesota, USA; was buried in Holy Family Cemetery, Lake Crystal, Blue Earth County, Minnesota, USA.
4. Bernice Emeline Monson was born on 2 Feb 1913 in Iowa, USA; died on 19 Nov 1995 in Minnesota, USA.
5. Sylvester Paul Monson was born on 15 Jan 1915 in Gilbert, Story County, Iowa, USA; died on 12 Dec 1972 in Orangevale, Sacramento County, California, USA; was buried in Mount Vernon Memorial Park, Fair Oaks, Sacramento County, California, USA.
6. Clarence William Monson was born on 20 Jan 1917 in Iowa, USA; died in 0Mar 1969 in Seattle, King County, Washington, USA.
7. Edward Louis Monson was born on 1 Dec 1921 in Minnesota, USA; died on 9 Sep 1974 in Minnesota, USA; was buried on 12 Sep 1974 in Fort Snelling National Cemetery, Hennepin County, Minnesota, USA.
8. Dorothy Marie Monson was born on 25 Oct 1923 in Springfield, Brown County, Minnesota, USA; died on 20 Jul 2004 in Fort Scott, Bourbon County, Kansas, USA; was buried in Mount Olive Cemetery, Pittsburg, Crawford County, Kansas, USA.
9. Allen Jerome Monson was born on 4 Feb 1927 in Minnesota, USA; died on 13 Feb 1998 in Mountlake Terrace, Snohomish County, Washington, USA.