The Wallsburg cemetery has 33 Walls names but no William or Madison; 30 Davis names but no James or John; 6 Penrods, but no Elizabeth.
There is an Ellen E. Penrod, b 3-18-1848, died 5-6-1925, wife of Abraham Penrod who was b 7-12-1844, and died 12-26-1893.
Hope this helps. I have names and phone numbers of people living in Wallsburg who might help. Contact me by e-mail. There is a FHC in Midway that covers Wallsburg.