| Adams County Economic Development Corp | 219-724-2588 | 313 W Jefferson St | Decatur | IN | 46733 |
| Custom Research & Tabulations Inc | 219-422-4444 | 519 Tennessee Ave | Fort Wayne | IN | 46805 |
| Data Bank Inc | 219-424-1711 | 803 S Calhoun St | Fort Wayne | IN | 46802 |
| Dennis Research Service Inc Main Ofc | 219-485-2442 | 3502 Stellhorn Rd | Fort Wayne | IN | 46815 |
| Dennis Research Service Inc Ofc | 219-483-2884 | Glenbrook Square Mall | Fort Wayne | IN | 46800 |
| Detwiler S M & Assoc Inc | 219-749-6534 | PO Box 15308 | Fort Wayne | IN | 46885 |
| Jay County Development Corp | 219-726-9311 | 121 W Main St | Portland | IN | 47371 |
| Johnson Index | 219-269-3666 | 109 W Market St | Warsaw | IN | 46580 |
| Kld Marketing Research | 219-464-4668 | 5 Washington St | Valparaiso | IN | 46383 |
| Market Strategies Inc | 219-233-3453 | 108 N Main St | South Bend | IN | 46601 |
