The following sources should be reviewed in order to find a location in Ireland for your ancestor, and help you to determine the date of his or her birth, marriage or death. Even if you are still none the wiser having reviewed all these sources, don't give up hope - take a look at the records relating to your ancestor's siblings too as they may hold the clue.
Conversations with Relatives
Make an effort to talk to your older relatives about what they remember of the family, their memories and reminiscences. It is the little details that help bring the story of your family to life, and it can be a very rewarding experience. Often your relative might also be able to show you photos, letters and other documents that will provide further information and clues about your family. Or they may remember conversations with a grandparent or older relative, about life in the old country. Even the smallest detail can provide a lead and open up research.
You might find that family members still have some old papers that can help with your research. While everyone would love to discover a record such as a family bible listing names and dates of births and deaths of ancestors, in reality most of us are unlikely to be this lucky. However, a whole range of other documents, personal papers and mementos can prove useful - these include everything from letters and photographs, memorial or mass cards, even newspaper cuttings. Remember, someone in your family kept these records because they were personally relevant. Take a closer look and see what they tell you about your family's origins.
Gravestone inscriptions and obituaries
Many Irish emigrants had fond memories of their homeland, and the last act of duty and love that a family could do for an Irish-born parent, might be to put up a gravestone which would record their place of origin in Ireland. For this same reason, newspaper obituaries are always worth a look.
Civil records of births, marriages and deaths
In the U.S. civil birth, marriage and death records are organised by state, so your approach will vary according to where your ancestor came from. Take a look at this guide to help you locate the birth, marriage and death records of your ancestors. (http://genealogy.about.com/library/blvitalus.htm). You can then write to the relevant body to obtain a copy of the birth, marriage or death record. These records will provide you with further information on family members.
The following US census returns often include information on place of birth and may be viewed online at www.ancestry.com: 1850, 1860, 1870, 1880, 1890, 1900, 1910, 1920 and 1930. If your ancestor was born in Ireland, normally only the country name will have been entered into the form, so it is recommended that you review other records to find an Irish county, parish, town or townland name to help narrow the search. The census is helpful in providing an approximate birth date for your ancestor.
You can search for these at www.familysearch.org/eng/Library/FHLC/frameset_fhlc.asp, by entering 'naturalization' into the search box and the area of the US your ancestor lived in. The records can then be ordered in to your local Family History Centre.
Will, probate and administration papers
These can be a useful source of more general family information. Sometimes an ancestor in the US will refer to his or her relations in Ireland, possibly giving a location for them, so it is certainly worthwhile seeing if any of your ancestors left a will.
Passenger lists can be accessed online via a number of key websites and some exist in book format also. The very early passenger arrival lists tend to document just the country of origin, but from the 1880s onwards they start to include more specific locations.
Original Place of residence/ settlement in the U.S.