Post Offices List in McKenzie County, North Dakota:
| Alexander Post Office | 602 Elk St, Alexander, ND 58831 |
| Arnegard Post Office | 110 Main St S, Arnegard, ND 58835 |
| Grassy Butte Post Office | 409 Main St, Grassy Butte, ND 58634 |
| Watford City Post Office | 1204 4th Ave Ne, Watford City, ND 58854 |