| Company A | Pittsburgh Rifles | Pittsburgh, Allegheny County, Pa. |
| Company B | Garibaldi Guards | Allegheny County, Pa. |
| Company C | Iron City Guards | Allegheny County, Pa. |
| Company D | Government Guards | Allegheny County, Pa. |
| Company E | Chartiers Valley Guards | Allegheny County, Pa. |
| Company F | Meadville Volunteers | Meadville, Crawford County, Pa. |
| Company G | City Guards | Allegheny County, Pa. |
| Company H | New Brighton Rifles | New Brighton, Beaver County, Pa. |
| Company I | McKeesport Union Guards | McKeesport, Allegheny County, Pa. |
| Company K | Allegheny Rangers | Allegheny County, Pa. |
| Field & Staff | | |
| Regimental Band | | |
| Unassigned Men | | |
