William W. Cargile was born about 1824, in Christian County, Kentucky. He was the son of John Cargill, III and Nancy Elizabeth Lewis.
William's family moved to Arkansas about 1837. William appears on the 1840 Searcy County census with his family. He is shown to be a male 15-20 years of age.
William married Cynthia Martin prior to 1850. Cynthia Martin was born about 1830, in Alabama.
The 1850 Conway County, Arkansas census shows William Cargil, 25, born in Kentucky and Cyntha, 20, born in Alabama. The census shows that neither of them could read or write. They were living in Benton Township near Quitman. Several other Cargile families lived in the same area.
The 1860 Conway County census shows the couple still living in Benton Township near Quitman. The census shows William W. Cargile, 35, a farmer and Cyntha, 30 years old. Living with them was Jessie H. Cargile, 24, a farmer, born in Arkansas. (This was probably Edward P. Cargile's son, and William's nephew.) The census shows William's real estate property was valued at $500 and his personal property at $400. Living next to William was his sister Keziah Palmer and her family.
William served as a member of Livingston's Company, Dobbins Regiment, Witt's Arkansas Cavalry in the Civil War.
William Cargile died October 10, 1864, in the Civil War.
Records show Cynthia applied for a widow's pension in Faulkner County, Arkansas on August 8, 1913.