How Many Costas are there?

Can ANYONE tell me exactly how many Costas roam these hills?  Every time I turn around, I see reference to yet another Costa kin either holding some obscure office or being appointed to something. 

Guy Costa should just be hired by KDKA since he gets almost as much airtime as pretty boy Jeff Verszyla.  Given that it might snow this weekend, I'm sure we'll see Guy tomorrow night. 

Seriously, how many are there?