Searching for my ancestors from Aghamore, County Mayo

Hi:

I am new to geneology and trying to find out more about my ancestors before visiting Ireland with my family this summer. My great-great grandparents, John Conboy and Ann McNalley (DOB: 1830-1832, also spelled McKnalley, MacAnnelly, or Connelly. She also sometimes is listed as Anna)were from Ireland. I suspect that they immigrated to the US separately and were marriedhere. They lived in St. Louis, MO and Plymouth, Illinois. I finally found a post in the 1877 publication of the Boston Pilot that is in searchof information of Ann's brother, Michael McKnalley, who had immigrated (approximately 1846)to the US and was living in Kansas City, MO. In thisarticle, it states thatAnn and Michael's parents were Patrick McKnalley and Mary Tarpy of Aghamore, County Mayo. I am not sure what part of Ireland John Conboy was from. Any information would be appreciated.

Thanks

Allison Pritchett