Province of Pennsylvania
He was born in Mercersburg in the Province of Pennsylvania on June 20, 1768, to Samuel Findlay and Jane Smith. He was a brother of James Findlay and John Findlay. Samuel Findlay's father, equally named Samuel Findlay, was born in County Londonderry in Ulster in 1711, settled in the Province of Pennsylvania in 1730 and died in Mercersburg, Pennsylvania in 1739.