Post Offices List in Elk River City, Minnesota:
| Elk River Post Office | 19120 Freeport St Nw, Elk River, MN 55330 |
| Elk River Carrier Annex Post Office | 560 3rd St Nw, Elk River, MN 55330 |
| Elk River Post Office | 19120 Freeport St Nw, Elk River, MN 55330 |
| Elk River Carrier Annex Post Office | 560 3rd St Nw, Elk River, MN 55330 |