| Business | Phone |
| Assessment Resource Ctr 2800 Maguire Blvd, Columbia 65201 | (573) 882-4694 |
| Rennier Associates 10900 S Hardwick Ln, Columbia 65201 | (573) 657-5044 |
| Geotel Corp 212 S 8th St, Columbia 65201 | (573) 474-1000 |
| Horizon Research Svc 409 Vandiver Dr # 6 # 102, Columbia 65202 | (573) 874-1333 |