| Business | Phone |
| Stone Environmental Engnrng 6460 Busch Blvd # 105, Columbus 43229 | (614) 888-8041 |
| Bischoff Miller & Assoc 1251 Dublin Rd, Columbus 43215 | (614) 481-4150 |
| Buckeye Engineering Po Box 26012, Columbus 43226 | (614) 430-0220 |
| Cps Consulting Group 1495 Old Henderson Rd, Columbus 43220 | (614) 459-6992 |
| Dlz Ohio Inc 6121 Huntley Rd, Columbus 43229 | (614) 848-4141 |
| E P Ferris & Assoc Inc 880 King Ave, Columbus 43212 | (614) 299-2999 |
| Eluster L Fields & Assoc 1233 Dublin Rd, Columbus 43215 | (614) 481-8902 |
| Ohio Geomatics Ltd 7423 Hayden Run Rd, Columbus 43202 | (614) 620-0331 |
| Fuller Mossbarger Scott & May 6600 Busch Blvd # 100, Columbus 43229 | (614) 846-1400 |
| Geo-Graphics Inc 3331 E Livingston Ave, Columbus 43227 | (614) 231-2016 |
| Geotechnics Inc 912 Bryden Rd, Columbus 43205 | (614) 253-0198 |
| M S Consultants Inc 2221 Schrock Rd, Columbus 43229 | (614) 898-7100 |
| Jones-Stuckey Ltd Inc 2323 W 5th Ave # 160, Columbus 43204 | (614) 486-0401 |