The general emergency number in the United States is 911. You can use this number anywhere in the United States to reach the police department, the fire department, and to call for emergency medical services, like an ambulance.
University of Maryland Police Department
Emergency Number: On campus: 911;
Off campus: 301-405-3333 (NOTE: This is only to reach the University Police Department for problems on campus. If you are not on campus, dial 911 for the emergency number.)
Non-Emergency: On campus: 5-3555; Off campus: 301-405-3555
Escort Service: On campus: 5-3555; Off campus: 301-405-3555