Patrick Corbitt married Mary Dearney, came to US 1850

Seeking information on Patrick Corbitt and his wife Mary Dearney, arrived in US in 1850.They settled in El Paso, IL.Patrick worked on building the railroad then became a farmer.Census info says they came from Tipperary, but family remembers them mentioning Cork.I believe they had a daughter Ellen that died young before coming to US.I have all the info on their children and everything forward in time, just really stumped on exactly where they came from.

Thanks in advance for any info --

Lori