| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Augusta, Lewis And Clark | 59410 |
| Postal/ZIP Codes in Canyon Creek, Lewis And Clark | 59633 |
| Postal/ZIP Codes in Craig, Lewis And Clark | 59648 |
| Postal/ZIP Codes in East Helena, Lewis And Clark | 59635 |
| Postal/ZIP Codes in Fort Harrison, Lewis And Clark | 59636 |
| Postal/ZIP Codes in Helena, Lewis And Clark | 59601, 59602, 59625, 59626 |
| Postal/ZIP Codes in Lincoln, Lewis And Clark | 59639 |
| Postal/ZIP Codes in Marysville, Lewis And Clark | 59640 |
| Postal/ZIP Codes in Wolf Creek, Lewis And Clark | 59648 |