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| License No. | Company | Address | City | State | Zip Code |
| 4-01877 | Bradys Bend Corp. | 930 Cass St. | New Castle | PA | 16101-5241 |
| 3-00745 | Commercial Stone Co. Inc. | 2200 Springfield Pike | Connellsville | PA | 15425-9503 |
| 8336 | Con Lime Inc. | PO Box 118 | Bellefonte | PA | 16823-0118 |
| 3-02135 | Coolspring Mining Inc. | PO Box 1328 | Uniontown | PA | 15401-1328 |
| 3-01684 | Graybec Lime Inc. | PO Box 448 | Bellefonte | PA | 16823-0448 |
| 3-02809 | Latrobe Construction Co. | PO Box 150 | Latrobe | PA | 15650-0150 |
| 3-00744 | Pioneer Mid Atlantic Inc. | 400 Industrial Blvd., PO Box 5P | New Kensington | PA | 15068-6639 |
| 3-00360 | Southdown Inc. | 1200 Smith St. Ste. 2400 | Houston | TX | 77002 |