| Business | Phone |
| Colonial Land Surveyors Inc 1679 S Dupont Hwy, Dover 19901 | (302) 734-0438 |
| Gerald A Donovan Sr Dover 19901 | (302) 734-3582 |
| Earl D Smith Pro Land Surveyor 490 N Dupont Hwy, Dover 19901 | (302) 734-3381 |
| Gerald A Donovan Assoc Inc 429 S Governors Ave, Dover 19904 | (302) 674-2903 |
| Robert L Larimore 1413 New Burton Rd, Dover 19904 | (302) 730-8682 |
| Mc Clure Associates Inc 140 Mifflin Rd, Dover 19904 | (302) 674-4558 |