| Post Office Name | US Post Office |
| Address | 123 Main St |
| City | Onaka |
| State | South Dakota |
| Phone Number | (605) 447-5885 |
| Latitude | 45.2018 |
| Longitude | -99.4508 |
57466 US Post Office in Onaka, South Dakota is located at 123 Main St. The Onaka Post Office Number is (605) 447-5885
