| Business | Phone |
| Absolute Investigations Inc Po Box 3680, Springfield 65808 | (417) 889-4700 |
| Agency Springfield 65804 | (417) 886-0304 |
| Bird Dog Investigations Po Box 1853, Springfield 65801 | (417) 863-7117 |
| Black Diamond Detective Springfield 65804 | (417) 882-1007 |
| Crossover Investigations Po Box 5172, Springfield 65801 | (417) 827-5730 |
| I Spy Investigations 1248 S Willow Ln, Springfield 65804 | (417) 831-7778 |
| Icl Investigations Springfield 65802 | (417) 300-1920 |
| Internal Theft Control 1347 S Airwood Dr, Springfield 65804 | (417) 886-8410 |
| J Miller Investigation Svc 1050 E Walnut St, Springfield 65806 | (417) 832-9888 |
| Springfield Security 520 S Fort Ave, Springfield 65806 | (417) 831-1697 |
| Southwest Investigating Agency 1121 S Glenstone Ave, Springfield 65804 | (417) 866-1756 |
| Robert Certin Investigations Springfield 65807 | (417) 888-1133 |
| Robert Cirtin Investigations 610a E Battlefield St # 169, Springfield 65807 | (417) 889-6906 |
| National Anti-Crime Institute 305 E Walnut St # 111b, Springfield 65806 | (417) 832-1890 |
| National Investigative Svc 1325 W Sunshine St # 228, Springfield 65807 | (417) 831-2500 |