Possibly the swiftest route to your roots.
Irish genealogy website directory.
www.from-ireland.net/genealogy/Census-Returns
Description:
Full government censuses were taken for all of Ireland every ten years from 1821-1911. In 1922, during the Civil war most of the returns for 1821-1851 were destroyed during a fire at the Four Courts which was then the public records office, some remnants do remain.