Hi, I found three Blacks listed in Maple Grove Cemetery in North Branch.They are:
James, d. August 31, 1881, buried in section A, 22y1m17d old when he died, son of J/A.
Mae H., born 1878, died 1943, buried in section C.
William J., born 1888, died 1934, buried in section C.
It is possible that the reason the others are listed is because there is no stone since these cemeteries were "read."
If you know the funeral home, you might be able to find out more about the burial information. I am a board member of the Lapeer County Genealogical Society.If I can help you further, please let me know.