I believe that I may have found my Seery's as stemming from Offaly (see message #5 above).
I have Patrick born 1840-44 in Ireland. His brother, John, born roughly 1834. Their younger brother Thomas born in roughly 1848. All three emigrated to the Philadelphia area. It seems that Patrick and John fought in the Civil War. While reseraching John's pension records at the National Archives in Washington, DC, I found a letter in the file, written by his wife, after his death. The letter asks for an increase in the amount of her pension, and provided various personal details as she was trying to demonstrate that she was indeed his wife. Among the information, it stated he was born in Kin's County (now Offaly), Ireland. Therefore, I believe this is where he and his brother's were born. Any information, or possible matches, are greatly appreciated.