| Business | Phone |
| Mank & Kunst 408 York Rd, Baltimore 21204 | (410) 296-8294 |
| Bps-Land Technology Inc 634 Deepdene Rd, Baltimore 21210 | (410) 435-0800 |
| Raphel & Assoc 205 Courtland Ave, Baltimore 21204 | (410) 825-1331 |
| Hopkins Engineering Baltimore 21206 | (410) 866-8226 |
| Site Rite Surveying Inc 200 E Joppa Rd # 101, Baltimore 21286 | (410) 828-9060 |
| Apr Assoc 7427 Harford Rd, Baltimore 21234 | (410) 444-4312 |
| Astermarine Inc 2700 Broening Hwy # 115, Baltimore 21222 | (410) 285-7800 |
| S J Martenet & Co 1114 Saint Paul St # 1a, Baltimore 21202 | (410) 539-4263 |
| Edwin L Smith 1020 Boyd St, Baltimore 21223 | (410) 528-1853 |
| Surveyors Baltimore 21225 | (410) 789-6626 |
| E F Raphel & Assoc 205 Courtland Ave, Baltimore 21204 | (410) 825-3908 |
| Gerhold Cross & Etzel 320 E Towsontown Blvd # 100, Baltimore 21286 | (410) 823-4470 |
| Hoffman & Hoffman 5502 Stonington Ave, Baltimore 21207 | (410) 448-0181 |
| Jst Engineering Co Inc 6912 N River Dr, Baltimore 21220 | (410) 335-9142 |
| Frank S Lee 719 Chesaco Ave, Baltimore 21237 | (410) 687-6922 |
| Spellman Larson & Assoc Inc 105 W Chesapeake Ave # 406, Baltimore 21204 | (410) 823-3535 |