The Maryland 3rd Congressional District comprises portions of Baltimore, Howard and Anne Arundel counties, as well as a significant part of the independent city of Baltimore. The seat is currently represented by John Sarbanes (D).
The last three people to represent Maryland in the United States Senate were all representatives of the third district. Those include the two current Maryland senators, Ben Cardin and Barbara Mikulski, as well as retired senator Paul Sarbanes.
Some have attributed the district's odd shape to gerrymandering in order to favor Democratic candidates following the 2000 Census.