On the website of the Archdiocese of Atlanta there is a section dedicated to their Office of Catholic Cemeteries. Having read that sentence you probably know where this article is going: headstone information.
On the webpage you can find PDF documents of headstone transcriptions from five cemeteries: Budapest, near Bremen/Waco; Locust Grove, near Sharon; Purification, also near Sharon; Sparta; and St. Patrick's, near the town of Washington.
Locust Grove, Purification, and St. Patrick cemeteries all contain burials of people born in Ireland. Where available, this information, including counties and parishes of origin, has been transcribed in the documents.
You can view the webpage, and the transcriptions, here.
In tomorrow's article, I will write in more detail about one such Irish Catholic community in Georgia, located in Locust Grove.