| Post Office Name | US Post Office |
| Address | 413 Main St |
| City | Frederick |
| State | South Dakota |
| Phone Number | (605) 329-2441 |
| Latitude | 45.8594 |
| Longitude | -98.5623 |
57441 US Post Office in Frederick, South Dakota is located at 413 Main St. The Frederick Post Office Number is (605) 329-2441