If you live in the city for 30 days or more and operate a vehicle in public space, DC law requires you to obtain a DC Driver license, unless you are eligible for reciprocity (students, active military, part-time residents, members of Congress, government appointees).
DMV offers a number of services related to a driver license. When obtaining a driver license, be prepared to also make the decision to become an organ and tissue donor, register to vote, or select the Veteran designation. If you are a male between the ages of 18-25, the DC DMV will register you with the Selective Service unless you choose to use the waiver form to opt-out of registering via the DC DMV driver license or identification card application process.
Please note that begining November 26, 2013, DC DMV is moving to a central issuance process and driver licenses will be mailed. They will no longer be issued over the counter and DC DMV does not mail to P.O. Boxes.