South Portland
Incorporated 1895 · city since 1898Set off from Cape Elizabeth in 1895. Despite its name, it was never part of the City of Portland.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoSouth Portland’s vote. Click a question for the statewide comparison.How South Portland Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently South Portland votes from the state.
Turnout in general elections
Ballots cast divided by active registered voters on election day. List maintenance shrinks the denominator in some years (for example 2022), which pushes the rate up.
Who Lives Here
American Community Survey 2020–2024South Portland at a Glance
South Portland is a city in Cumberland County, Maine, incorporated in 1895, a city since 1898. It has an estimated 27,007 residents (2025), compared with 26,498 in the 2020 Census.
It is part of Congressional District 1, State Senate District 29, State House District 120 (35% of residents), State House District 122 (33% of residents), State House District 121 (32% of residents), and County Commissioner District 4, in the Greater Portland region.
In the 2024 presidential race, Kamala Harris carried South Portland with 74.4% to 22.9% for Donald Trump. That was a Democratic margin of 51.5 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Janet Mills carried South Portland with 78.5% to 20.2% for Paul LePage. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried South Portland with 63.8% to 18% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 9th most Democratic of 504 towns.
As of March 7, 2026, South Portland had 17,205 active registered voters: 52.9% Democrats, 14.6% Republicans, 28.8% unenrolled, and 3.3% Green Independents. The median household income is $86,838 and the median home value $441,200, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 1896 (with county figures from 1821), voter registration since 1954, referendum votes, turnout, and Census and American Community Survey figures. Sources are listed at the foot of the page and on the Data Sources page.