| Business | Phone |
| Lewis Knecht Private Invstgtr 717 S Grand Traverse St, Flint 48502 | (810) 767-8333 |
| Browne's Investigations 3172 S Dye Rd, Flint 48507 | (810) 341-1200 |
| Wise One Investigators & Sec 1113 Whitingham Dr, Flint 48503 | (810) 744-4323 |
| Niklace Agency Flint 48501 | (810) 691-7163 |