| | Dance and Theatre | | Takoma Park/Silver Spring | CU/112 | 240-567-1388 |
| | Data Center | | Rockville | CS/108 | 240-567-7230 |
 | Diagnostic Medical Sonography | | Takoma Park/Silver Spring | HC/435 | 240-567-5563 |
| Disability Support Services | DSS - Germantown | Germantown | SA/172 | 240-567-7770 |
| Disability Support Services | DSS - Rockville | Rockville | CB/122 | 240-567-5058 |
| Disability Support Services | College Access Program | Rockville | CB/116 | 240-567-5224 |
| | Disability Support Services | TDD for Hearing Impaired (dial 10 digits) | Rockville | CB/122 | 301-294-9672 |
| Disability Support Services | DSS-Takoma Park | Takoma Park/Silver Spring | ST/133 | 240-567-1480 |
| | Disability Support Services | TDD for Hearing Impaired (dial 10 digits) | Takoma Park/Silver Spring | ST/133 | 301-587-7207 |
| Distance Learning | Distance Learning | Germantown | PK/165 | 240-567-6000 |
| Diversity Management Institute | WDCE | Gaithersburg Business Training Center | GBTC/426 | 240-567-2583 or 240-567-3828 |
| Drama | | Rockville | TA/119 | 240-567-5250 |
| | Driver Education, MVA | WDCE, Public Safety | Gaithersburg Business Training Center | GBTC/400 | 240-567-5188 |
| DSS Learning Center | Disability Support Services | Rockville | CB/116 | 240-567-5224 |
| | Dual Enrollment Programs | | Rockville | SB/101 | 240-567-4140 |
| | Duplicating | | Germantown | SA/101 | 240-567-7716 |
| | Duplicating | | Rockville | HU/11A | 240-567-7352 |
| | Duplicating Room | Humanities | Rockville | HU/11B | 240-567-7351 |
| | Duplicating Room | Mannakee | Mannakee | MK/125 | 240-567-7353 |