| Department Name | Phone Number |
| Accounting and Financial Affairs | (301)-447-5353 |
| Admissions | (301)-447-5214 |
| Advancement | (301)-447-7432 |
| Advancement Services | (301)-447-5363 |
| Alumni Relations | (301)-447-5362 |
| Annual Giving | (301)-447-5360 |
| Archives/Special Collections | (301)-447-5397 |
| Athletic Trainer | (301)-447-5386 |
| Athletics | (301)-447-5296 |
| Business and Finance | (301)-447-5234 |
| Campus Activities and Student Leadership | (301)-447-5274 |
| Campus Ministry | (301)-447-5223 |
| Capital Projects and Engineering | (301)-447-5799 |
| Career Center | (301)-447-5202 |
| Catholic Education Ministries | (301)-447-3707 |
| Center for Student Diversity | (301)-447-6932 |
| Center for Professional and Continuing Studies | (301)-682-8315 |
| College Store | (301)-447-5271 |
| Communications | (301)-447-5366 |
| Community Service | (301)-447-7437 |
| Custodial | (301)-447-4236 |
| Dean of Students | (301)-447-5848 |
| Development | (301)-447-5361 |
| Dining Services | (301)-447-5226 |
| Emergency | (301)-447-8111 |
| Executive Vice President | (301)-447-7407 |
| Financial Aid | (301)-447-5207 |
| Flynn Chair of Christian Ethics | (301)-447-5796 |
| Generations Campaign Office | (301)-447-6872 |
| Grotto Office | (301)-447-5318 |
| Human Resources | (301)-447-5372 |
| Center for Instructional Technology | (301)-447-5220 |
| Institutional Research | (301)-447-5306 |
| Issue and Control (ARRC) | (301)-447-5722 |
| Learning Services | (301)-447-5006 |
| Library | (301)-447-5244 |
| Maintenance (Work Order) | (301)-447-4858 |
| Media Center | (301)-447-5280 |
| Mount Cafe | (301)-447-4272 |
| Mount Family Association | (301)-447-3156 |
| Mountain Echo | (310)-447-5246 |
| Office of Seminary Development | (301)-447-5017 |
| Outdoor Adventures | (301)-447-7433 |
| Physical Plant | (301)-447-5377 |
| Post Office | (301)-447-5339 |
| President's Office | (301)-447-5600 |
| Priest's Dining/Kitchen | (301)-447-5257 |
| Print Shop | (301)-447-5201 |
| Public Safety | (301)-447-5357 |
| Purchasing | (301)-447-5211 |
| Radio Station | (301)-447-5240 |
| Receiving | (301)-447-4349 |
| Recreational Services | (301)-447-5290 |
| Registrar | (301)-447-5215 |
| Residence Life | (301)-447-5274 |
| Seminary | (301)-447-5295 |
| Sports Information | (301)-447-5384 |
| Student Government Association | (301)-447-5273 |
| Telecommunications | (301)-447-5200 |
| Ticket Office (Sports) | (301)-447-5700 |
| VP for Institutional Advancement | (301)-447-6826 |
| Wellness Center | (301)-447-5288 |
| Writing Center | (301)-447-5367 |
| Yearbook | (301)-447-5379 |
| Academic Affairs | (301)-447-5218 |
| Academic Services | (301)-447-5333 |
| School of Business | (301)-447-5396 |
| MBA Program | (301)-447-5326 |
| School of Education and Human Services | (301)-447-5371 |
| College of Liberal Arts | (301)-447-7435 |
| Communication Studies | (301)-447-5367 |
| English | (301)-447-5365 |
| Foreign Languages and Literature | (301)-447-5322 |
| Language Learning Center | (301)-447-4726 |
| History | (310)-447-5375 |
| Philosophy | (301)-447-5368 |
| Political Science | (301)-447-5374 |
| Pre-Law Program | (301)-447-8398 |
| Psychology | (301)-447-5394 |
| Sociology | (301)-447-5373 |
| Theology | (301)-447-5370 |
| Visual & Performing Arts | (301)-447-5308 |
| School of Natural Science and Mathematics | (301)-447-6826 |
| Math & Computer Science | (301)-447-5291 |
| Science | (301)-447-5376 |
| ROTC (Military Science) | (301)-447-5350 |
