Cumberland County, Maine Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 1st-largest in Maine
The population of Cumberland County, Maine is 305,940 as of the 2023 American Community Survey, making it the 1st-largest county in Maine. The median household income is $92,983, the median home value is $411,400, and the median age is 42.1.
The population of Cumberland County has grown 11.5% since 2010 (281,481 → 313,809), a +0.78% annualized rate.
305,940
Population
+0.78%
Annual growth
366
People / sq mi
$92,983
Median Income
$411,400
Median Home Value
Cumberland County covers 836 sq mi of land at 365.9 people per square mile.
About Cumberland County, ME
Educational attainment is the headline number in Cumberland County: 52.2% of adults 25 and older have a four-year degree. Cumberland County is a county in Maine with a population of 305,940. It is the #1-largest of all counties in Maine nationally.
Earnings sit at the high end: a median household income of $92,983, above the US median of $78,538. Very few residents live in poverty — 3.4%, below the national 12.4%. Real estate commands a premium here — a median home value of $411,400, with typical rent around $1,492.
Cumberland County is among the best-educated US counties: 52.2% of adults 25 and older hold a bachelor’s degree, above the national 35.0%. An unusually large 19.4% of workers are remote, above the national 14.0%, and the average commute runs about 23 minutes each way.
The education numbers are the throughline: a college-heavy population in Cumberland County usually coincides with higher incomes and a workforce concentrated in professional and information industries.
Cumberland County Population History (2010-2024)
The county of Cumberland County had a population of 281,481 in 2010 and 313,809 in 2024, a 11.5% growth over 14 years. The peak was 313,809 in 2024. Average annual growth rate: 0.78%.
313,809
Population (2024)
281,481
Population (2010)
313,809
Peak (2024)
0.78%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 281,481 |
| 2011 | 282,753 |
| 2012 | 283,742 |
| 2013 | 285,681 |
| 2014 | 288,274 |
| 2015 | 289,704 |
| 2016 | 291,522 |
| 2017 | 292,549 |
| 2018 | 294,363 |
| 2019 | 296,052 |
| 2020 | 303,606 |
| 2021 | 306,152 |
| 2022 | 309,309 |
| 2023 | 311,258 |
| 2024 | 313,809 |
Race & Ethnicity
| White | 87.6% |
| Black or African American | 3.3% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.0% |
| Two or More Races | 0.0% |
Age & Sex
42.1
Median Age
51.3%
Female
48.7%
Male
19.9%
Age 65+
Age Distribution
Children (under 15): 14.9% · Seniors (65+): 19.9%
Income & Poverty
| Median household income | $92,983+$21,210 vs state |
| Mean household income | $125,434 |
| Per-capita income | $54,238 |
| Poverty rate | 3.4%-3.1% vs state |
| Unemployment rate | 2.2% |
| Employment-to-population | 65.7% |
Top Industries by Employment
The largest employment sector in Cumberland County is professional & business services, accounting for 27.5% of workers.
How residents commute
1.0%
Drive alone
5.1%
Carpool
65.6%
Public transit
19.4%
Work from home
23.4 min
Avg commute
Housing
$411,400+$145,000 vs state
Median home value
$1,492
Median rent
70.4%
Homeownership rate
151,519
Total housing units
85.8%
Occupied
14.2%
Vacant
29.6%
Renter-occupied
Social & access
95.3%
With health insurance
95.6%
With broadband internet
38.9%
Foreign-born
6.7%
Veterans (18+)
11.3%
With a disability
92.6%
Speak language other than English at home
Education
96.5%
High School+
52.2%
Bachelor's+
Largest cities in Maine
Other counties in Maine
Part of Maine
Metro areas in Maine
County rankings
Frequently Asked Questions
Cumberland County, Maine has a population of 305,940 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 1st-largest county in Maine. Population density is 366 people per square mile.
The population of Cumberland County has grown 11.5% since 2010 (281,481 → 313,809), a +0.78% annualized rate.
The median household income in Cumberland County, Maine is $92,983, with mean (average) household income of $125,434 and per-capita income of $54,238. 3.4% of residents live below the federal poverty level.
In Cumberland County, the largest racial and ethnic groups are White (87.6%), Black or African American (3.3%), Hispanic or Latino (1.0%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Cumberland County, Maine is 42.1 years. Residents are 51.3% female and 48.7% male.
The median home value in Cumberland County is $411,400 and median monthly rent is $1,492. 70.4% of occupied housing units are owner-occupied. The county has 151,519 total housing units, 14.2% of which are vacant.
The largest employment sector in Cumberland County, Maine is professional, scientific, and management services, employing 27.5% of workers. The unemployment rate is 2.2%.
Portland is among the largest cities associated with Cumberland County, Maine, with a population of 68,505.
Cumberland County, ME Climate
Cumberland County, ME has an average annual temperature of 7.3°C (45°F) and receives about 1160 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
7.3°C
Avg Temp
1160
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -7° / 20° | 96 mm |
| February | -5° / 23° | 84 mm |
| March | 0° / 32° | 103 mm |
| April | 6° / 43° | 107 mm |
| May | 12° / 54° | 95 mm |
| June | 17° / 63° | 88 mm |
| July | 20° / 68° | 83 mm |
| August | 20° / 67° | 82 mm |
| September | 15° / 59° | 86 mm |
| October | 9° / 48° | 106 mm |
| November | 3° / 38° | 119 mm |
| December | -3° / 26° | 111 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Cumberland County, ME
The most comfortable months to visit Cumberland County, ME are typically July, August and June, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 26°C high). The coldest is January (near -12°C low). November is usually the wettest month.
Where to stay near Cumberland County
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Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.