| Localité | Code postal |
|---|---|
| Adrian, Armstrong | 16210 |
| Apollo, Armstrong | 15613 |
| Avonmore, Armstrong | 15618 |
| Cadogan, Armstrong | 16212 |
| Cowansville, Armstrong | 16218 |
| Craigsville, Armstrong | 16262 |
| Dayton, Armstrong | 16222 |
| Distant, Armstrong | 16223 |
| East Brady, Armstrong | 16028 |
| Elderton, Armstrong | 15736 |
| Fairmount City, Armstrong | 16224 |
| Ford City, Armstrong | 16226 |
| Ford Cliff, Armstrong | 16228 |
| Freeport, Armstrong | 16229 |
| Karns City, Armstrong | 16041 |
| Kittanning, Armstrong | 16201 |
| Leechburg, Armstrong | 15656 |
| Manorville, Armstrong | 16238 |
| Mayport, Armstrong | 16240 |
| McGrann, Armstrong | 16236 |
| New Bethlehem, Armstrong | 16242 |
| North Apollo, Armstrong | 15673 |
| North Leechburg, Armstrong | 15656 |
| Nu Mine, Armstrong | 16244 |
| Oak Ridge, Armstrong | 16245 |
| Parker, Armstrong | 16049 |