Knox County, Maine Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates · 10th-largest in Maine
The population of Knox County, Maine is 40,860 as of the 2023 American Community Survey, making it the 10th-largest county in Maine. The median household income is $71,903, the median home value is $290,800, and the median age is 49.2.
The population of Knox County has grown 3.2% since 2010 (39,727 → 40,981), a +0.22% annualized rate.
40,860
Population
+0.22%
Annual growth
112
People / sq mi
$71,903
Median Income
$290,800
Median Home Value
Knox County covers 365 sq mi of land at 112.0 people per square mile.
About Knox County, ME
Knox County is a county in Maine with a population of 40,860. It ranks #10 among counties in Maine by population. The median age is 49.2, older than the national median. The population is 50.3% male and 49.7% female.
The median household income in Knox County is $71,903, near the US median of $74,580. 4.1% of residents live below the federal poverty level. Home values sit at a median of $290,800, with monthly rent averaging $1,079. The homeownership rate of 78.5% is higher than the national rate of 64.8%.
Educational attainment in Knox County reflects 39.1% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 14.5% of workers primarily work from home, similar to the national work-from-home rate of 14.2%. The average commute is 20.1 minutes each way.
Knox County Population History (2010-2024)
The county of Knox County had a population of 39,727 in 2010 and 40,981 in 2024, a 3.2% growth over 14 years. The peak was 41,251 in 2022. Average annual growth rate: 0.22%.
40,981
Population (2024)
39,727
Population (2010)
41,251
Peak (2022)
0.22%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 39,727 |
| 2011 | 39,674 |
| 2012 | 39,613 |
| 2013 | 39,693 |
| 2014 | 39,897 |
| 2015 | 39,797 |
| 2016 | 39,769 |
| 2017 | 39,774 |
| 2018 | 39,760 |
| 2019 | 39,792 |
| 2020 | 40,663 |
| 2021 | 41,078 |
| 2022 | 41,251 |
| 2023 | 41,044 |
| 2024 | 40,981 |
Race & Ethnicity
| White | 94.7% |
| Black or African American | 0.4% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.4% |
| Two or More Races | 0.0% |
Age & Sex
49.2
Median Age
49.7%
Female
50.3%
Male
27.1%
Age 65+
Age Distribution
Children (under 15): 13.6% · Seniors (65+): 27.1%
Income & Poverty
| Median household income | $71,903+$130 vs state |
| Mean household income | $95,678 |
| Per-capita income | $42,729 |
| Poverty rate | 4.1%-2.4% vs state |
| Unemployment rate | 2.3% |
| Employment-to-population | 55.6% |
Top Industries by Employment
The largest employment sector in Knox County is professional & business services, accounting for 21.0% of workers.
How residents commute
0.0%
Drive alone
4.7%
Carpool
69.4%
Public transit
14.5%
Work from home
20.1 min
Avg commute
Housing
$290,800+$24,400 vs state
Median home value
$1,079
Median rent
78.5%
Homeownership rate
24,428
Total housing units
73.6%
Occupied
26.4%
Vacant
21.5%
Renter-occupied
Social & access
93.7%
With health insurance
94.4%
With broadband internet
39.6%
Foreign-born
8.6%
Veterans (18+)
12.7%
With a disability
95.6%
Speak language other than English at home
Education
94.3%
High School+
39.1%
Bachelor's+
Largest cities in Maine
Other counties in Maine
Part of Maine
Metro areas in Maine
County rankings
Frequently Asked Questions
Knox County, Maine has a population of 40,860 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 10th-largest county in Maine. Population density is 112 people per square mile.
The population of Knox County has grown 3.2% since 2010 (39,727 → 40,981), a +0.22% annualized rate.
The median household income in Knox County, Maine is $71,903, with mean (average) household income of $95,678 and per-capita income of $42,729. 4.1% of residents live below the federal poverty level.
In Knox County, the largest racial and ethnic groups are White (94.7%), Hispanic or Latino (1.4%), Black or African American (0.4%). Figures are from the US Census Bureau's 2023 ACS 5-year estimates and reflect self-reported responses.
The median age in Knox County, Maine is 49.2 years. Residents are 49.7% female and 50.3% male.
The median home value in Knox County is $290,800 and median monthly rent is $1,079. 78.5% of occupied housing units are owner-occupied. The county has 24,428 total housing units, 26.4% of which are vacant.
The largest employment sector in Knox County, Maine is professional, scientific, and management services, employing 21.0% of workers. The unemployment rate is 2.3%.
Portland is among the largest cities associated with Knox County, Maine, with a population of 68,505.
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Full rankings of Maine counties
Statewide data for Maine
Population, race, income, age, and trends across Maine
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.