Castle Hill
Incorporated 1903Named for a tall log lookout structure that early surveyors built on a steep hill near the river, which resembled a castle; it was used during the Aroostook War.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoCastle Hill’s vote. Click a question for the statewide comparison.How Castle Hill Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Castle Hill 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 2020–2024Castle Hill at a Glance
Castle Hill is a town in Aroostook County, Maine, incorporated in 1903. It has an estimated 370 residents (2025), compared with 373 in the 2020 Census.
It is part of Congressional District 2, State Senate District 1, State House District 6, and County Commissioner District 2, in The County region.
In the 2024 presidential race, Donald Trump carried Castle Hill with 56.9% to 42.7% for Kamala Harris. That was a Republican margin of 14.2 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Paul LePage carried Castle Hill with 57.4% to 42.6% for Janet Mills. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Castle Hill with 52.1% to 39.2% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 203rd most Republican of 504 towns.
As of March 7, 2026, Castle Hill had 254 active registered voters: 20.5% Democrats, 44.9% Republicans, 28.3% unenrolled, 5.1% Green Independents, and 1.2% Libertarians. The median household income is $54,250 and the median home value $145,300, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 1868 (with county figures from 1839), 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.