Aroostook County
Established 1839From an Indigenous word usually translated 'beautiful river' or 'beautiful water'; sources attribute it to the Wolastoqey (Maliseet) or Mi'kmaq language.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoAroostook County’s vote. Click a question for the statewide comparison.How Aroostook County Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Aroostook County 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 2020–2024Aroostook County at a Glance
Aroostook County is one of Maine’s sixteen counties, established in 1839. It has an estimated 66,609 residents (2025), compared with 67,105 in the 2020 Census.
In the 2024 presidential race, Donald Trump carried Aroostook County with 62.3% to 36.3% for Kamala Harris. That was a Republican margin of 26 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Paul LePage carried Aroostook County with 57.7% to 40.5% for Janet Mills. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Aroostook County with 47.8% to 42.7% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 3rd most Republican of 16 counties.
As of March 7, 2026, Aroostook County had 38,909 active registered voters: 25.5% Democrats, 40.2% Republicans, 30.1% unenrolled, and 3.7% Green Independents. The median household income is $56,700 and the median home value $149,700, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 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.