| Business | Phone |
| Accent Consulting 937 Old Harmony Rd, Newark 19713 | (302) 366-8400 |
| Allstates Design & Development 242 Chapman Rd, Newark 19702 | (302) 369-9788 |
| Amec Bio Pharmaceuticals 225 Corporate Blvd # 204, Newark 19702 | (302) 366-0855 |
| Applied Control Engineering 700 Creek View Rd, Newark 19711 | (302) 738-8800 |
| Frederic R Harris Inc 3205 Drummond Plz, Newark 19711 | (302) 369-8665 |
| Johnson Mirmiran & Thompson 121 Continental Dr, Newark 19713 | (302) 266-9600 |
| Karins & Assoc Inc 17 Polly Drummond Shp Ctr #201, Newark 19711 | (302) 369-2900 |
| Sorption Technologies Inc 1 Innovation Way # 100, Newark 19711 | (302) 369-6166 |
| Pressure Systems Engineering 2605 Eastburn Ctr, Newark 19711 | (302) 283-0180 |
| Ten Bears Environmental 1080 S Chapel St, Newark 19702 | (302) 731-8633 |
| Rummel Klepper & Kahl 99 Chapman Rd, Newark 19711 | (302) 737-2125 |
| Delaware Engineering & Design 315 S Chapel St, Newark 19711 | (302) 738-7172 |