I saw your post and I thought I could help but I have looked at different sites but all it listed was Italy. But I don't know if you got that on a birth certificate or just online, but I would start with the birthplace of his father and mother. His father is Antonio Girardi or it could be Girarde not sure of the way they spelled it, He was born 9 July, 1846 in Civili, Prata, Sannita, Caserta, Campania, Italy. My guess is that Giuseppe or Joe or Joseph as he changed his name when he came to America, was born where his father was born, don't know for sure but it could be a possibility. And his mother Rosa Maria Talarico born 28 Dec. 1849 in Prata, Caserta, Campania, Italy. It looks like they didn't move around like some families do.
I don't know if you have this but Antonio's parents are; Domenico Girardi born 1810 - Unk. and his mother is ; Margherita Cardillo born -unk -died unk.
Rosa Maria Talarico's parents are Luigi Talarico b. 1822 and mother - Angela Mauro b. 1822 died - unk.
If you need any more help I will try and help you but I am not sure if you will ever know where Giuseppe was born in Italy Unless you can somehow call the place of where your great grandfather was born to see if he was really born there. I tried to help but I am sorry that I couldn't find out exactly of where he was born. Nancy