The Jacob Zimmerman, who was my g.g. uncle, was born September 12, 1845 near Ashland in Schuylkill County. He was the son of Solomon and Elizabeth (Shepley) Zimmerman. I have some other Jacob Zimmerman's from Berks and Schuykill Counties but they do not work with your Jacob's birthdate. If I come across anything else, I will forward it to you and good luck with your search.