William Guinn Black may have been the William Black recorded in the 1860 census of Cumberland Township, Adams County, Pennsylvania. The census listed him as a 27-year-old farmer born in Pennsylvania, with real estate valued at $1,000 and personal estate valued at $125. He was enumerated in dwelling 482, family 538, with Eliza C. Black and two young children. A genealogical reference reports that Eliza Caskey married William Guinn Black at Taneytown Lutheran Church in 1854, but the marriage remains unconfirmed here.
Age in 1860: 27
Sex: M
Race: W
Birthplace: Pennsylvania
Township: Cumberland
Dwelling Number: 482
Family Number: 538
Spouse: Eliza C. Caskey
Identification Status: Possible
Confidence Level: Possible
Evidence Strength: Moderate Circumstantial