This cemetery is the Black Section of Georgetown Cemetery, it is located across the street, most of it is unmarked, though some metal funeral home markers are there they are unreadable. 
The present visible section is inclosed in chain link fencing and is a modern addition to what probably was a quite large cemetery. 
It was noted as Georgetown Cemetery, Negro Pottsboro Cemetery and Negro Georgetown  Cemetery in death records.
I found the article at the bottom of the page which tells of the burial of Andy Rice here and also tells us when the cemetery was established.

Brown family plot 

Brown, Josephine  July 24 1874 - Dec 23 1941 
Brown, William   June 15 1866 - June 20 1964 
 children: Luther, Charlie, Hassell, Aaron, Monroe 

Johnson plot

Johnson, Myrtle    29 Apr 1886 - 3 July 1975
Johnson, Jack    15 Oct 1884 - 15 Apr 1958

Unmarked Graves
Rice, Andy        Died Aug. 1904 Age abt 55 yrs.  See article below.
Ring, Della       11 Oct 1874- 31 Dec 1917, died of TB. Born in Georgetown, she was a housewife, married, born in Georgetown, Grayson Co., Texas. Dau of Charles Morrison b. in Grayson Co., and Lucy (last name very hard to read on death cert. looks like g?rmg? or the first letter could be a y.or z) born in Terr ( Indian Territory).  Informant is not filled out. She was buried 1 Jan 1918.  
 

Though this article is 'tacky' to say the least it does give us the info 
on when the cemetery was established and that he is buried here. 
I wish someone had bought him a tombstone. 
There might have been one at one time but nothing is there now.
Dallas Morning News
30 Aug 1904