It happened near Ridge Road and Oak Drive in Damascus just before 7:50 a.m., a spokesperson with the Montgomery County Police Department told Daily Voice.
The 12-year-old was taken to a local hospital with serious but non-life-threatening injuries.
The driver stayed at the scene and is cooperating with the investigation, police added.
No further details were released.
Click here to follow Daily Voice Glen Burnie and receive free news updates.