Maryland's 6th congressional district

Maryland's 6th congressional district elects a representative to the United States House of Representatives from the northwest part of the state. The district comprises all of Garrett, Allegany, Frederick, and Washington counties as well as a portion of Montgomery County. April McClain Delaney (D) is its current representative.

The previous boundaries of the district were the subject of a Supreme Court lawsuit over partisan gerrymandering. The court ruled that taking into account partisan advantage when redistributing is "not judiciable" in federal courts, leaving it to the states. In 2012, the district was found to be the ninth least compact congressional district in the United States.

John Delaney, who represented the district after unseating 11-term incumbent republican Roscoe Bartlett, gave up the seat in 2018 to focus on his bid for president and was succeeded by fellow Democrat David Trone, who won re-election in 2020 as well. However, after redistricting in 2022, the district became much more competitive, giving up a portion of heavily Democratic Montgomery County in exchange for a more Republican-leaning portion of Frederick County. The district leans just slightly Democratic, with the heavily conservative, white, and rural regions of Western Maryland being balanced out by politically competitive Frederick County and heavily Democratic and culturally diverse suburbs in Montgomery County such as Gaithersburg and Germantown. Trone was re-elected by nearly 10 points over Maryland House of Delegates member Neil Parrott, mainly by swamping Parrott in Montgomery County. Trone gave up the seat in the 2024 election cycle in order to run for U.S. Senate. April McClain Delaney, wife of former 6th district congressman John Delaney, succeeded Trone in the district, defeating Neil Parrott with 53.0% of the vote.