I have a Jacob Stambaugh b: 1775 Cordorus, York, PA who married Anna Maria Markley/Merkley b: June 1783. They moved to Linn co. Iowa and were counted in the 1840 census there. By the 1850 census they were in Schuyler Co.IL.
He was the son of John Peter Stambaugh and Unknown. None of this is documented (except the census records.) Do you think there might be a relationship between your Jacob and mine? Do you know who the children were of your Jacob?