| Business | Phone |
| Commonwealth Investigators Inc Po Box 625, Roanoke 24004 | (540) 992-3129 |
| Delta Investigations Inc 8233 Williamson Rd, Roanoke 24019 | (540) 563-4808 |
| Envirnmntl Investigations 116 Kirk Ave Sw A, Roanoke 24011 | (540) 343-9595 |
| Global Investigations 5219 Peters Creek Rd Nw, Roanoke 24019 | (540) 366-0596 |
| Global Investigations 7977 Williamson Rd, Roanoke 24019 | (540) 366-0596 |
| Guardian Investigations 1225 Washington, Roanoke 24018 | (540) 793-1170 |
| Mountain Investigations 313 Campbell Ave Sw, Roanoke 24016 | (540) 985-9609 |
| Security Patrol Inc Roanoke 24012 | (540) 563-4431 |
| Sullivan Investigations 1220 Franklin Rd Sw, Roanoke 24016 | (540) 344-1123 |
| Vanhorn & Vanhorn Private Roanoke 24012 | (540) 362-1372 |