When John S Greer was born on 23 August 1839, in Kentucky, United States, his father, Solomon Greer, was 32 and his mother, Alphiah Fitzpatrick, was 19. He married Mahala HOLLOWAY in 1864, in Simpson, Kentucky, United States. They were the parents of at least 6 sons and 4 daughters. He lived in Simpson, Kentucky, United States in 1860 and Madison Township, Cedar, Missouri, United States for about 20 years. He died on 27 August 1909, in Cedar, Missouri, United States, at the age of 70.