| Locality | Post Code |
|---|---|
| Alderson, Pittsburg | 74522 |
| Bache, Pittsburg | 74501 |
| Blanco, Pittsburg | 74528 |
| Blocker, Pittsburg | 74529 |
| Canadian, Pittsburg | 74425 |
| Crowder, Pittsburg | 74430 |
| Eufaula, Pittsburg | 74432 |
| Haileyville, Pittsburg | 74546 |
| Hartshorne, Pittsburg | 74547 |
| Haywood, Pittsburg | 74501 |
| Indianola, Pittsburg | 74442 |
| Kiowa, Pittsburg | 74553 |
| Krebs, Pittsburg | 74554 |
| McAlester, Pittsburg | 74501 |
| Pittsburg, Pittsburg | 74560 |
| Quinton, Pittsburg | 74561 |
| Richville, Pittsburg | 74501 |
| Savanna, Pittsburg | 74565 |
| Scipio, Pittsburg | 74501 |
| Stuart, Pittsburg | 74570 |