| Business | Phone |
| De Witt Investigations Richmond 94804 | (510) 232-6400 |
| Fred Waters Investigations Richmond 94804 | (510) 236-6200 |
| Global Process Server Group 1433 San Joaquin St, Richmond 94804 | (510) 232-0968 |
| Royal Investigation & Patrol Richmond 94804 | (510) 215-0619 |
| Specialized Investigations 530 W Cutting Blvd, Richmond 94804 | (510) 236-3006 |