| Locality | Post Code |
|---|---|
| Absaraka, Cass | 58002 |
| Alice, Cass | 58031 |
| Amenia, Cass | 58004 |
| Argusville, Cass | 58005 |
| Arthur, Cass | 58006 |
| Ayr, Cass | 58007 |
| Briarwood, Cass | 58104 |
| Buffalo, Cass | 58011 |
| Casselton, Cass | 58012 |
| Chaffee, Cass | 58079 |
| Davenport, Cass | 58021 |
| Durbin, Cass | 58059 |
| Embden, Cass | 58079 |
| Enderlin, Cass | 58027 |
| Erie, Cass | 58029 |
| Fargo, Cass | 58102, 58103, 58104, 58105, 58108, … |
| Fingal, Cass | 58031 |
| Frontier, Cass | 58104 |
| Galesburg, Cass | 58035 |
| Gardner, Cass | 58036, 58042 |
| Grandin, Cass | 58038 |
| Harwood, Cass | 58042 |
| Hickson, Cass | 58047 |
| Horace, Cass | 58047 |
| Hunter, Cass | 58048 |
| Kindred, Cass | 58051 |