Thank you for answering. I found my mystery Thomas Eisenhart who was married to Hannah Kerchner, both of Lehigh Co PA, with the help of Gail Belytschko. Hannah (nee Kerchner) Eisenhart died in 1844. Thomas remarried another Hannah ____. Thomas Eisenhart is found living with the 2nd Hannah in the 1860 census of Millerstown (now Macungie), Lehigh Co PA, household #463. Thomas and family moved out of the area after after 1860. As a result of information provided by Carol Belytschko, we find Thomas in the 1880 census in Gregg Twsp, Union Co PA, p.438D, household #100. He is found with his 2nd wife, Hannah, maiden name unknown. His surname was spelled as Isenhart at that time. This is why I could not find him after he left the area. I never looked for the name spelled with an "I", although phonetically I should have. From Carol Belytschko's research, I have learned this Thomas was the s/o Johann Jacob Eisenhart and Rosina Knappenberger, both of Lehigh County PA. I still need to learn the exact date of birth for this Thomas. I now have that he was born in 1801 and died 15 Aug 1887, in Gregg Twsp. He is buried in the Lutheran Cemetery which is now within the grounds of the Federal Prison located at Allenwood, Union Co PA.
Thanks for letting me know of all the Eisenhart resource possibilities. I will check into them. Regarding the reunion bash, I will pass on that, since I am not an Eisenhart descendant. Hannah Kerchner was a sibling of an anscestor in my line, John Frederick Kerchner, and I was trying to find out what happened to her. Now I know.