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Diana187
The 6 cities in the Roman Empire that had both Christian and Jewish communities by 300 A.D. are: 
1) Carthage 
2) Ephesus 
3) Corinth 
4) Rome 
5) Damascus 
6) Anitoch 
Hope this helped you!! :)
Carthage, Ephesus, Corinth, Rome, Damascus, and Anitoch