John married Emma Leininger on 30 May 1899 in Iowa, USA. Emma (daughter of Peter Leininger and Susan C. Heller) was born on 21 Nov 1876 in Iowa, USA; died in 1950 in Boone County, Iowa, USA. [Group Sheet] [Family Chart]

1. Edna Anna Cooper was born on 19 Dec 1900 in Iowa, USA; died on 20 Aug 1990 in Iowa, USA.
2. Raymond Lyon Cooper was born on 12 Sep 1902 in Boone County, Iowa, USA; died on 23 Aug 1968.
3. Daniel Ervin Cooper was born on 25 Mar 1904 in Boone County, Iowa, USA; died on 30 Jan 1996 in USA.
4. Howard Ignatius Cooper was born on 4 Nov 1905 in Iowa, USA; died on 2 Jul 1978 in Iowa, USA; was buried in Sacred Heart Cemetery, Boone, Boone County, Iowa, USA.
5. Cecilia Jean Cooper was born on 3 Nov 1908 in Iowa, USA; died on 2 Oct 1985 in Cedar Rapids, Linn County, Iowa, USA; was buried in St. John's Cemetery, Cedar Rapids, Linn County, Iowa, USA.
6. Sister Leona Ethel Cooper was born on 19 Oct 1910 in Boone County, Iowa, USA; died in in USA.
7. Cleo Francis Cooper was born on 5 Jul 1912 in Iowa, USA; died on 27 Jul 1966 in Iowa, USA.
8. Edwin Joseph Cooper was born on 21 Mar 1915 in Boone County, Iowa, USA; died on 11 Nov 1994 in Ottumwa, Wapello County, Iowa, USA; was buried in Ames Municipal Cemetery, Ames, Story County, Iowa, USA.
9. Bernita Marie Cooper was born on 19 Dec 1917 in Boone County, Iowa, USA; died on 19 May 2003 in Fremont, Alameda County, California, USA.
10. Sarah Janella Cooper