Maine's 1st congressional district is a congressional district in the U.S. state of Maine. The geographically smaller of the state's two congressional districts, the district covers the southern coastal area of the state. The district consists of all of Cumberland, Knox, Lincoln, Sagadahoc, and York counties, and most of Kennebec County. Located within the district are the cities of Portland, Brunswick, and Saco. The district is currently represented by Democrat Chellie Pingree.
Maine was initially a part of the state of Massachusetts. Massachusetts was allocated 20 districts after the 1810 U.S. census. When Maine became a state in 1820, seven of those districts were credited to it. Since then, all but the 1st and 2nd congressional districts have become obsolete.
For the 118th and successive Congresses (based on redistricting following the 2020 census), the district contains all or portions of the following counties and municipalities:
The 2018 election was the first to use ranked-choice voting as opposed to plurality voting since the district's creation. However, since the leading candidate had a majority of first-choice votes, no distribution of preferences was conducted.