Islesboro
Incorporated 1789 as IslesboroughIncorporated as Islesborough, a spelling later shortened to Islesboro. It was first called Long Island Plantation.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoIslesboro’s vote. Click a question for the statewide comparison.How Islesboro Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Islesboro 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 2020–2024Islesboro at a Glance
Islesboro is a town in Waldo County, Maine, incorporated in 1789 as Islesborough. It has an estimated 596 residents (2025), compared with 583 in the 2020 Census.
It is part of Congressional District 2, State Senate District 11, State House District 40, and County Commissioner District 1, in the Midcoast region.
In the 2024 presidential race, Kamala Harris carried Islesboro with 72.5% to 25.1% for Donald Trump. That was a Democratic margin of 47.4 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Janet Mills carried Islesboro with 76% to 22.7% for Paul LePage. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Islesboro with 62% to 19.8% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 12th most Democratic of 504 towns.
As of March 7, 2026, Islesboro had 504 active registered voters: 54.8% Democrats, 13.7% Republicans, 29.6% unenrolled, and 2% Green Independents. The median household income is $88,438 and the median home value $288,800, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 1868 (with county figures from 1827), 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.