Pennsylvania
| Company | Category | Area | Address | Web | Contact person | |
| TRI-COUNTY VETERINARY SVC | Veterinarians | Pennsylvania | 1041 MONTOUR RD, LOYSVILLE, Perry, Pennsylvania, 17047-9216, USA | - | - | Clyde S Mc Millen |
| TRI-COUNTY WATER SVC INC | Plumbing Contractors | Pennsylvania | 3685 LEIKE RD, PARKESBURG, Chester, Pennsylvania, 19365-1704, USA | - | - | Daniel Hershey |
| TRI-CRYSTAL PRODUCTS INC | Soaps & Detergents (Wholesale) | Pennsylvania | 2220 MEETINGHOUSE RD, BOOTHWYN, Delaware, Pennsylvania, 19061-3407, USA | - | - | Anthony Costa |