William Abercrombie (1765-after 1850) appears in the 1800 census for Laurens County, South Carolina with a household of one male aged 26-45 [himself], three males under aged 10, and one female aged 16-26.

The 1800 census for Laurens County was organized by military regiments and companies. William Abercrombie was listed in the Saludy [Saluda] Regiment, Upper Battalion of Laurens District among Captain John Cochran's militia company # XXI which included 103 men among whom were also John Abercrombie, James Abercrombie, Esq., Jonathan Abercrombie, Hastings Dial, Isaac Dial, Archabald McDanold [McDaniel], Sr., Archabald McDanold, Jr., and William McDanold.

By 1840 William Abercrombie was in Fayette County, Georgia and appears there in the 1850 census, which shows that he was 85 years old [born in 1765] and was born in South Carolina.