| Business | Phone |
| St Mary's Cnty Register-Wills 41605 Courthouse Dr, Leonardtown 20650 | (301) 475-5566 |
| St Mary's County Administrator 23115 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4461 |
| Charles County Central Svc Leonardtown 20650 | (301) 475-4497 |
| Community Services Leonardtown 20650 | (301) 475-3499 |
| St Mary's County Alcohol Brd 23115 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4543 |
| St Mary's County Community Svc 21580 Peabody St, Leonardtown 20650 | (301) 475-4632 |
| St Mary's County Cooperative 21580 Peabody St # 62, Leonardtown 20650 | (301) 475-4477 |
| St Mary's County Elections 23115 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4651 |
| St Mary's County Emergency 23090 Leonard Hall Dr, Leonardtown 20650 | (301) 475-8016 |
| St Mary's County Finance Ofc 23115 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4469 |
| St Mary's County Info Line 23115 Leonard Hall, Leonardtown 20650 | (301) 475-5621 |
| St Mary's County Personnel 23115 Leonard Hall Dr Fl 3, Leonardtown 20650 | (301) 475-4515 |
| St Mary's County Planning Dept 22740 Washington St, Leonardtown 20650 | (301) 475-4449 |
| St Mary's County Record Ctr 41650 Tudor Hall Rd, Leonardtown 20650 | (301) 475-7844 |
| St Mary's County States Atty's 23110 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4890 |
| St Mary's County Travel & Trsm Leonard Hall Dr Fl 2, Leonardtown 20650 | (301) 475-4411 |
| St Marys County Animal Control 23090 Leonardhall Dr, Leonardtown 20650 | (301) 475-8018 |
| St Marys County Finance Office Governmental Ctr, Leonardtown 20650 | (301) 475-4200 |
| St Marys County Land Use Dept 23510 Leonard Hall Dr, Leonardtown 20650 | (301) 475-4200 |
| Honorable C Clark Raley 41605 Courthouse Dr, Leonardtown 20650 | (301) 475-4320 |
| Honorable F Michael Harris 41605 Courthouse Dr, Leonardtown 20650 | (301) 475-4683 |
| Honorable Karen H Abrams 41605 Court House Dr, Leonardtown 20650 | (301) 475-4585 |
| Honorable Marvin S Kaminetz 41605 Courthouse Dr, Leonardtown 20650 | (301) 475-4623 |
| Marcey Halfway House 41550 Doctors Xing Way, Leonardtown 20650 | (301) 475-4701 |