| Business | Phone |
| Bryles & Assoc Inc 2825 S Glenstone Ave # 227, Springfield 65804 | (417) 887-1035 |
| Marketsource Research Ctr Inc 743 W Battlefield St, Springfield 65807 | (417) 877-7808 |
| Salestek 2003 E Sunshine St, Springfield 65804 | (417) 887-1515 |
| Opinion Research Specialists 5093 S Lafontaine Ave, Springfield 65810 | (417) 889-4506 |