General Register Office - GRO

National Library of Ireland

The National Archives of Ireland Genealogy

Genealogical Society of Ireland

Valuation Office (Griffith's)

Irish Ancestors

Irish Family History Foundation (Has all the Heritage Centers)

Land Registry & Registry of Deeds

List of Professional Researchers

Online Census Finder

Genfindit (order certs. online)

Surnames

Catherine Delahunty's website (Connor)

Miscellaneous