| Alkire Genealogical Research | 217-245-5911 | 203 S Fayette St | Jacksonville | IL | 62650 |
| Barth Karolyn | 217-854-5417 | 213 Union St | Carlinville | IL | 62626 |
| D & C Marketing Research | 217-789-1911 | 936 N 2nd St | Springfield | IL | 62702 |
| Graf & Assocs | 217-698-3834 | 3001 Spring Mill Dr | Springfield | IL | 62704 |
| Hedgcock Laverne | 217-367-5824 | 908 E Sunnycrest Dr | Urbana | IL | 61801 |
| Kaydus Consulting Co | 217-793-8976 | 2492 Emerson Rd | New Berlin | IL | 62670 |
| Macoupin County Historical Society | 217-854-2850 | 920 W Breckenridge St | Carlinville | IL | 62626 |
| Orr Research Center | 217-236-4911 | RR 1 | Perry | IL | 62362 |
| Resource Economics Corp | 217-337-6000 | 2004 S Wright St | Urbana | IL | 61801 |
| Synergetic Business Research | 217-483-4547 | 225 Goldenrod Dr | Chatham | IL | 62629 |
| Technosophy Inc | 217-367-6002 | 1109 S Orchard St | Urbana | IL | 61801 |
