The National Archives of Ireland have made the information recorded during the 1901 census available online.
The National Archives of Ireland website has already had thousands of visits from people around the world interested in learning more about their ancestors.
Genealogist Tom Coughlan, who normally traces other people's roots, discovered something new about one of his own relatives. According to the 1901 census, his grandfather at the age of 19 worked as a railway porter and had a younger brother who was also a railway porter.
A high volume of users around the globe have accessed the census.
The census gathered information from 850,000 households across the 32 counties of Ireland on 31 March 1901. The findings show names, ages, familial relationships, occupations, literacy and languages spoken. All of this information and copies of the actual documents are now available to view for free online.
The 1911 census findings were made publicly available last year. Head of Special Projects at the National Archives, Caitriona Crowe, says that following the publication of the 1911 census, people were anxious to see what was happening ten years earlier. To date, the 1911 census publications have been accessed 260 million times by seven and a half million people.
An RTÉ News report broadcast on 3 June 2010. The reporter is Joe Mag Raollaigh.
