| Business | Phone |
| Martin State Airport 701 Wilson Point Rd # 1, Baltimore 21220 | (410) 682-8800 |
| Aviation Administration Pier C Terminal Bldg # 3, Baltimore 21240 | (410) 859-7060 |
| Mass Transit Adm-Call-A-Lift 1515 Washington Blvd, Baltimore 21230 | (410) 682-5438 |
| Mass Transit Administration 6 Saint Paul St # 500, Baltimore 21202 | (410) 539-5000 |
| Transportation Dept 2310 Broening Hwy # 295, Baltimore 21224 | (410) 631-1000 |
| Transportation Dept 3202 Southern Ave, Baltimore 21214 | (410) 333-7729 |
| Transportation Dept Fort Ave & Wallace Stamp;, Baltimore 21230 | (410) 333-6256 |
| Transportation Dept Port Adm 401 E Pratt St, Baltimore 21202 | (410) 385-4700 |
| Transportation Dept-Motor Div 707 N Calvert St, Baltimore 21202 | (410) 787-7665 |
| Transportation Dept-Police 4330 Broening Hwy, Baltimore 21222 | (410) 288-8580 |