The name of this site is Covington Cemetery.

No dates or name of husband in source (survey listing on LDS microfilm, as transcribed by June Hanna).

Mary Ann KING married 20 JUN 1850 in Muscogee County, Georgia, to William M. CONVINGTON.

Nancy Kate Rogers' "A History of Chattahoochee County, Georgia," (1933), p. 352, shows: Mary (7) married William COVINGTON, who died from wounds received during the American Civil War. 5 children, viz.: Teresa, James, Mittie, William "Billy," and Sallie. Teresa married Charles ROGERS; one son, Olin ROGERS. Mittie married M[r]. BOYD, one son: Covington BOYD. Billy married Fatie CALHOUN, four daughters: Ethel (Mrs. Robert McBRYDE), Elba, Eva, and Mae COVINGTON. Sallie married Sterling JENKINS, three sons: Will Ed., Drane, and Sterling. P. 350-51 reports that Mary KING (born 26 SEP 1829) married William COVINGTON, and died at Box Springs, Georgia; she was child 7 of 11 of Henry KING (29 JAN 1796 -- 30 JUN 1882) and Elizabeth "Betsey" (LEE) KING (08 JUL 1795 -- 29 OCT 1866).
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From Contributor #48388243:

1870 census of Halloca District (Militia District No. 787) Chattahoochee Co., Geo., dwelling and household No. 33 ~~~ Henry King (74 N.C.) male, no occupation," holding real estate valued at $16,000 and personal estate valued at $3,000; G. Wood King (33 Geo.) male, Farmer, no real estate valued, personal estate $1,500; Alice King (21 (Geo.) female, At Home; Mary Covington (40 Geo.), female, Keeping House; Teresa Covington (18 Geo.), female, House Work; James Covington (16 Geo.), male, Farm Laborer; William Covington (14 Geo.) male, Farm Laborer; Mary Covington (12 Geo.) female, Attending School; Sarah Covington (10 Geo.) female, Attending School; Hannah Radney (40 Geo.) Mulatto female, Domestic Servant; George Radney (16 Geo.) male, Mulatto male, Farm Laborer; Jacob Radney (14 Geo.) Black male, Farm Laborer; Barbara Radney (12 Geo.) Black female, Domestic Servant; Francis Gilmore (35 Geo.) Black female, Domestic servant; George Gilmore (12 Geo.) Black male, Domestic Servant; Ella Gilmore (4 Geo.) Mulatto female; and Stella Gilmore (2 months Geo.), Black female.