| Business | Phone |
| Airport Porsche Audi Inc 168 N Dupont Hwy, New Castle 19720 | (302) 328-7186 |
| New Castle County Airport 151 N Dupont Hwy, New Castle 19720 | (302) 571-6474 |
| Penobscott Properties 135 N Dupont Hwy # B, New Castle 19720 | (302) 322-4477 |
| Dassault Falcon Jet - New Castle County Airport- Ground Services-Fuel Hanger 191 North Dupont Highway, New Castle 19720 | (302) 322-7350 |
| Dassault Falcon Jet - New Castle County Airport- Maintenance 191 North Dupont Highway, New Castle 19720 | (302) 322-7527 |
| Dassault Falcon Jet - New Castle County Airport- Personnel 191 North Dupont Highway, New Castle 19720 | (302) 322-7380 |
| New Castle County Airport - Marketing Dupont Highway, New Castle 19720 | (302) 571-6444 |