Since your audience is people searching their relatives named Hanna, it would help me help you if you put the name, date, and place in the subject line.I rewrote your subject line above based on your question.Perhaps now with Pennsylvania and a date in there you might get a response.
I have noticed that the farther back you go in time the more people you would be related to whose descendants could help you.So you could put the name of the county in Ireland.Then again, many Americans do not know the name of the county they are from in Ireland, so puttingthe name of the immigrant to the U.S. would also be helpful.(Most American researchers stop at their immigrant ancestor once he/she is here, not doing the international research.)What was the man's name?I hope he had children.If someone had no children, fewer people have researched him or her.Hope this helps.
My Thomas Hanna (b. 1850 in Ireland-) was in New York state, with a son George Charles Hanna in Connecticut, not Pennsylvania.