Post Offices List in Foster County, North Dakota:
| Carrington Post Office | 87 9th Ave N, Carrington, ND 58421 |
| Glenfield Post Office | 161 Glenfield St, Glenfield, ND 58443 |
| Grace City Post Office | 128 City St, Grace City, ND 58445 |
| Mchenry Post Office | 322 Johnston St, Mchenry, ND 58464 |