| Business | Phone |
| Us Post Office 1221 Rossmoor Pkwy, Walnut Creek 94595 | (925) 000-1111 |
| Us Post Office 2070 N Broadway, Walnut Creek 94596 | (925) 000-1111 |
| Us Post Office 1322 Locust St, Walnut Creek 94596 | (925) 000-1111 |
| Us Post Office 1813 Ygnacio Valley Rd, Walnut Creek 94598 | (925) 000-1111 |
| Us Post Office 1922 Tice Valley Blvd, Walnut Creek 94595 | (925) 000-1111 |
| Us Post Office 2244 Oak Grove Rd, Walnut Creek 94598 | (925) 000-1111 |