William married Elizabeth Ellen Gumm on 31 Aug 1864 in Bourbon County, Kansas, USA. Elizabeth (daughter of Jehu (John) Gumm and Annie Shoup) was born on 31 Aug 1833; died on 24 May 1902 in Dry Creek, Ada County, Idaho, USA; was buried in Boise, Ada County, Idaho, USA. [Group Sheet] [Family Chart]

1. Leslie Leonard Hammer was born on 24 Jul 1865 in Bourbon County, Kansas, USA; died on 22 Apr 1954 in Boise, Ada County, Idaho, USA; was buried in Boise, Ada County, Idaho, USA.
2. Anna Theresa Hammer was born about Dec 1866 in Kansas, USA; died on 26 Dec 1953; was buried in Cheyenne, Laramie County, Wyoming, USA.
3. Eva Jane Hammer was born on 17 Sep 1869 in Ellis, Ellis County, Kansas, USA; died on 15 Jan 1949 in Pendleton, Umatilla County, Oregon, USA; was buried in Wallowa, Wallowa County, Oregon, USA.
4. William Franklin Hammer was born on 1 Apr 1871 in Fort Scott, Bourbon County, Kansas, USA; died on 6 Jul 1938 in Boise, Ada County, Idaho, USA; was buried in Boise, Ada County, Idaho, USA.