Also, three people were playing Monday afternoon in Clifton Park, police said, and they were robbed.
The cellphone game has captivated fans who wander neighborhoods in search of the fantastic creatures. Distracted players have also been robbed in Parkville and at the University of Maryland.
Baltimore police said they're working to determine charges for the driver who sideswiped the patrol car. They have not released his name.
"You can't wander aimlessly around," said T.J. Smith, a Baltimore police spokesman. "Pay attention to your surroundings. There are way too many people that have their heads buried in their phones trying to catch a Pokemon and the criminals are catching you."