Monmouth
Incorporated 1792Named for the Revolutionary War Battle of Monmouth (N.J.), at the suggestion of Gen. Henry Dearborn, who fought there. Earlier called Freetown, Bloomingborough and Wales Plantation.
Voter Registration
Active voters, Secretary of State file of March 7, 2026Current enrollment
Registration history
Recent General Election Results
Referendums
YesNoMonmouth’s vote. Click a question for the statewide comparison.How Monmouth Compares
Presidential margin vs. Maine
Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Monmouth 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 2020–2024Monmouth at a Glance
Monmouth is a town in Kennebec County, Maine, incorporated in 1792. It has an estimated 4,252 residents (2025), compared with 4,066 in the 2020 Census.
It is part of Congressional District 2, State Senate District 14, State House District 56, and County Commissioner District 2, in the Central Maine region.
In the 2024 presidential race, Donald Trump carried Monmouth with 56.7% to 41.1% for Kamala Harris. That was a Republican margin of 15.6 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Paul LePage carried Monmouth with 53.7% to 44.2% for Janet Mills. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Monmouth with 48.8% to 43.2% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 277th most Republican of 504 towns.
As of March 7, 2026, Monmouth had 2,908 active registered voters: 25% Democrats, 38.8% Republicans, 30.8% unenrolled, and 5% Green Independents. The median household income is $74,648 and the median home value $274,100, against $74,733 and $296,600 statewide.
Below the summary figures, this page has election results back to 1868 (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.