The three non-military gravestones in the cemetery all have the last name Parker. They are all relatives of David Parker, who was one of Timbuctoo’s first settlers in 1826, and who was arguably the most prominent member of the Timbuctoo community for several decades. His first wife, Eliza Parker, died in 1847. He second wife, Matilda, died in 1870. There is also a stone for his son Frisby, who died in 1872. The first US Colored Troops' gravestone is also from the early 1870s, but clearly, the cemetery was in operation before the Civil War broke out in 1861.
Gravestone photos courtesy of Sue Melnick Fajgier and Holly Draycott

The inscription reads:
ELIZA PARKER
Died Sep. 1847
In the 44th year of her age

The inscription reads:
MATILDA
wife of David Parker
Died March 1, 1870
Aged 69 years

The inscription reads:
FRISBY
son of David Parker
Married Oct. 20, 1872
Died June 26, 1873
aged 45 years