Post office locations in 19720
| Post Office | Address | Phone | Hours |
| CENTERPOINT | 105 JOHNSON WAY HISTORIC NEW CASTLE, DE 19720 - 9997 | 302-328-6472 | |
| MANOR | 100 MCMULLEN AVE NEW CASTLE, DE 19720 - 9996 | 302-328-5893 | Mon-Fri 09:00 AM - 01:00 PM 02:00 PM - 05:00 PM Sat 08:00 AM - 11:30 AM Sun Closed |
| NEW CASTLE | 501 DELAWARE ST NEW CASTLE, DE 19720 - 9998 | 302-328-6472 | Mon-Fri 08:30 AM - 05:00 PM Sat 07:30 AM - 01:30 PM Sun Closed |
| WILMINGTON BOX | 147 QUIGLEY BLVD HISTORIC NEW CASTLE, DE 19720 - 9696 | 302-323-2260 | Mon-Fri 08:00 AM - 07:00 PM Sat 08:00 AM - 04:00 PM Sun Closed |