Waldo County

Established 1827

Named for Brig. Gen. Samuel Waldo, proprietor of the Waldo Patent. It was formed mainly from the western part of Hancock County.

Congressional District 2 Midcoast Central Maine Greater Bangor

Population

40,693

2025 est. · 2020 Census 39,607

Household income

$72,782

Maine $74,733

Home value

$257,700

Maine $296,600

Registered voters

27,330

As of March 2026

Enrollment edge

D+0.6

Democrats over Republicans

Household income and home value are median values. Registered voters are active registrants.

Voter Registration

Active voters, Secretary of State file of March 7, 2026

Current enrollment

Registration history

Recent General Election Results

County & prosecutorial offices

Referendums

YesNoWaldo County’s vote. Click a question for the statewide comparison.

How Waldo County Compares

Presidential margin vs. Maine

Waldo CountyMaine

Democratic minus Republican share of the candidate vote. The gap between the lines shows how differently Waldo County votes from the state.

Turnout in general elections

Waldo County turnout

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 2020–2024

Waldo County at a Glance

Waldo County is one of Maine’s sixteen counties, established in 1827. It has an estimated 40,693 residents (2025), compared with 39,607 in the 2020 Census.

In the 2024 presidential race, Kamala Harris carried Waldo County with 50.4% to 47% for Donald Trump. That was a Democratic margin of 3.4 points, against a Democratic margin of 6.9 points statewide. In the 2022 governor’s race, Janet Mills carried Waldo County with 54.8% to 43.3% for Paul LePage. In the 2024 U.S. Senate race, Angus King (Unenrolled) carried Waldo County with 50.1% to 35.5% for Demi Kouzounas. On the Partisan Electoral Alignment Index (Partisan EAI), it ranks as the 7th most Democratic of 16 counties.

As of March 7, 2026, Waldo County had 27,330 active registered voters: 32.6% Democrats, 32% Republicans, 30.9% unenrolled, and 4.1% Green Independents. The median household income is $72,782 and the median home value $257,700, against $74,733 and $296,600 statewide.

Below the summary figures, this page has election results back to 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.