Post Office - New Castle 435 S Cascade St New Castle, PA 16108 Phone : (724) 656-7221 Passport Application Services - New Castle 435 S Cascade St New Castle, PA 16108 Phone : (724) 656-7221 New Castle Postal Empl Cu 435 S Cascade St New Castle, PA 16108 Phone : (724) 656-7249 Express Mail 435 S Cascade St New Castle, PA 16108 Phone : (724) 656-7214 New Castle Apwu 435 S Cascade St New Castle, PA 16108 Phone : (724) 658-6448