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.

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:[3] 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.