| Business | Phone |
| Apex Investigative Svc Inc Elk Grove 95624 | (916) 686-2999 |
| C Michael Group Inc Elk Grove 95624 | (916) 525-2701 |
| Gara Specialized Investigation 4801 Laguna Blvd # 105 Pmb 345, Elk Grove 95758 | (916) 769-3536 |
| Kap Business Solutions 4815 Laguna Park Dr, Elk Grove 95758 | (916) 424-1652 |
| G W Koehler Elk Grove 95624 | (916) 685-5841 |
| Nicholas Investigations Elk Grove 95624 | (916) 689-6259 |
| Williams Investigations Po Box 2255, Elk Grove 95759 | (916) 687-6767 |
| Tim Henderson Investigations Elk Grove 95624 | (916) 689-0401 |