Have a possible match for you. I have a Jacob Alspach in Fairfield County Ohio, b. 13 aug 1779, d. 14 Jan 1857 also in Fairfield. I don't have marriage data, but I have family data going further back. If this turns out to be your Jacob (29 at time of your Sarah's birth) then I would be happy to show you the rest. If interested, contact me directly at email firstname.lastname@example.org . We would share ancestry by Jacob's older brother George. Parents are Jacob Alspach and Anna Maria Rausch.