There weren't addresses as we think of a number and a street. People were identified by a townland in which they lived. If you have no other guideline, I would go to the Irish research websites and see if you can narrow down the location by entering their names. Once you get a vague location, you can go to the church which holds their records of baptism and marriages. This is likely on-line for Co. Kerry. There was no census so the only other way would be to check the government records which documents land holders and tenants. They are called the Tithe Books (1827-31) and also the Griffith's Valuation (1851-2).