|
| Company | Production | Employees | County |
| Commercial Stone Co. Inc. | 2,024,227 | 109 | Fayette |
| Graybec Lime Inc. | 1,354,176 | 142 | Centre |
| Coolspring Mining Inc. | 1,351,702 | 43 | Fayette |
| Con Lime Inc. | 279,200 | 49 | Centre |
| Bradys Bend Corp. | 0 | 17 | Armstrong |
| Latrobe Const Co. | 0 | 31 | Westmoreland |
| Pioneer Mid Atlantic Inc. | 0 | 33 | Westmoreland |
| Southdown Inc. | 0 | 35 | York |