Hi, According to the book, "Master Index for all Tombstones in Madison County, Arkansas", there are only 3 Wilcox burials in the county.
1.Della McFee Wilcox, born 8 February 1899 died 22 November 1981, daughter of THomas & Mary HEATHERLY McFee, wife of Walter E. Wilcox.Della is buried in Mt. Olive Cemetery which is actually in Washington County, Arkansas, but which is very close to the Madison County line.
2.Nancy Wilcox - she's buried in a small Wilcox family cemetery on a homestead filed on 18 April 1905 by Nancy Wilcox.There were 4 graves at this location but only one commercial tombstone, which read:"Nancy Wilcox, wife of I. V., born 8 November 1834 died 5 July 1908."The other 3 graves were marked with fieldstones.
3.Dr. Samuel Wilcox who died July 1898.Dr. Wilcox is believed to be buried in Hindsville Cemetery even though he doesn't have a tombstone with his name on it.He was married to Nancy Caroline BEACH.Dr. WIlcox practiced medicine at Hindsville, Arkansas.
Hope this helps.
Joy Russell Madison County Genealogical & Historical Society