| Business | Phone |
| Us Post Office 151 Cascade Galleria, New Castle 16101 | (724) 652-4611 |
| Us Post Office 202 S Jefferson St, New Castle 16101 | (724) 652-3157 |
| Us Post Office 4 E Maitland Ln, New Castle 16105 | (724) 654-2241 |
| Us Post Office 435 S Cascade St, New Castle 16108 | (724) 656-7200 |