County · Maine

Knox County, Maine

Knox County, Maine. Knox County had 41,117 residents in 2025 by the Census Bureau's estimate, up 1.3% since 2020, slower than Maine (+3.8%). It holds 20 places (1 city, village or borough, 17 towns and townships and 2 census-designated) and 13 census tracts. GEOID 23013.

Residents, July 2025 estimate

41,117

Census Bureau estimate (no margin published)
2020 Census count: 40,607 · ACS 2020-2024: 41,003

Median household income

$74,096

±$3,739 (90% margin)
Maine: $74,733

Median home value

$324,900

±$14,707 (90% margin)
Maine: $296,600

Median gross rent

$1,165

±$70 (90% margin)
Maine: $1,139

How many people live in Knox County, and is it growing?

The 2020 Census counted 40,607 residents in Knox County. The Census Bureau estimates 41,117 for July 1, 2025, up 1.3% since 2020, slower than Maine (+3.8%). The 2020-2024 American Community Survey puts the population at 41,003 over 365 square miles of land.

July 2020→2021 +426 (41,089)
2021→2022 +202 (41,291)
2022→2023 −214 (41,077)
2023→2024 −113 (40,964)
2024→2025 +153 (41,117)

Knox County in Maine. Boundaries: Census Bureau 2024.

Counts, ACS 2020-2024 5-year estimates, with the change from 2015-2019
Measure	Knox County	Maine	Change since 2015-2019
Total population	41,003	1,387,817	+1,244
Households	18,484±485	597,159	+1,464
Average household size	2.12±0.06	2.26	−0.12
Housing units	24,564±110	751,876	+164

Knox County's population since 2000

From 39,618 in 2000 to 41,117 in 2025: up 3.8%. The 2000, 2010 and 2020 figures are census counts. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.

2000 Census 39,618
2005 (estimate) 40,571
2010 Census 39,736
2015 (estimate) 39,797
2020 Census 40,607
2025 (estimate) 41,117

Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); PEP Vintage 2025 (CO-EST2025); 2020 Census · Check it at data.census.gov

What cities and towns are in Knox County?

Knox County holds 20 places: 1 city, village or borough (an incorporated place), 17 towns and townships (county subdivisions with their own government) and 2 census-designated places. The largest is Rockland with 7,142 residents (2025 estimate). Places that cross a county line are listed with the share of their 2020 residents who live in this county.

Places in Knox County, ACS 2020-2024 5-year estimates. Ring: estimate with a coefficient of variation over 40%.

Rockland	city	6,936	7,035±17	$56,533	$245,800	10.4%	100%
Camden	town	5,232	5,242±15	$82,344	$520,600	9.0%	100%
Warren	town	4,865	4,932±17	$74,616	$232,700	6.0%	100%
Camden CDP	CDP	3,850	3,682±421	$78,788	$498,800	9.6%	100%
Rockport	town	3,644	3,675±18	$86,979	$469,000	5.3%	100%
Thomaston	town	2,739	2,769±20	$56,435	$271,700	6.6%	100%
St. George	town	2,594	2,606±21	$89,155	$356,300	7.7%	100%
Union	town	2,383	2,663±365	$80,724	$267,600	10.2%	100%
Thomaston CDP	CDP	1,836	2,055±309	$52,133	$269,500	8.9%	100%
Hope	town	1,698	1,748±260	$86,766	$373,400	5.3%	100%
Washington	town	1,592	1,624±241	$59,861	$195,200	15.3%	100%
South Thomaston	town	1,511	1,381±260	$86,838	$341,300	4.2%	100%
Owls Head	town	1,504	1,482±186	$87,325	$413,300	5.7%	100%
Cushing	town	1,502	1,460±225	$83,500	$409,800	7.7%	100%
Appleton	town	1,411	1,360±229	$53,618	$235,600	9.7%	100%
Vinalhaven	town	1,279	1,216±170	$72,963	$428,400	7.3%	100%
Friendship	town	1,142	1,213±159	$75,625	$275,000	10.0%	100%
North Haven	town	417	480±87	$87,500	$440,200	8.8%	100%
Isle au HautGEOID 2301335135	town	92	69±31	$49,500	$593,800	2.9%	100%
Matinicus Isle PlantationGEOID 2301344165	plantation	53	48±25	$65,417	$350,000	0.0%	100%

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 place-by-county parts · Check it at data.census.gov

Who lives in Knox County?

The median resident of Knox County is 49.5 years old; 16.8% are under 18 and 27.9% are 65 or older. The largest group is non-Hispanic white residents at 93.2%, then non-Hispanic residents of two or more races at 3.8%. 3.1% of residents were born outside the United States.

Age, origin and education, ACS 2020-2024 5-year estimates. Race groups are non-Hispanic; Hispanic includes any race.
Measure	Knox County	Maine	Change since 2015-2019
Median age	49.5±0.4	44.8	+1.1
Under 18 years	16.8%±0.2 pts	18.1%	–
65 years and over	27.9%±0.2 pts	22.4%	–
Hispanic or Latino (any race)	1.9%	2.2%	+0.4 pts
White alone, not Hispanic	93.2%±0.5 pts	89.9%	−2.0 pts
Black or African American alone, not Hispanic	0.3%±0.2 pts	1.8%	–
Asian alone, not Hispanic	0.5%±0.2 pts	1.1%	no clear change
American Indian and Alaska Native alone, not Hispanic	0.1%±0.1 pts	0.3%	–
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0.0%±0.1 pts	0.0%	–
Two or more races, not Hispanic	3.8%±0.6 pts	4.2%	–
Some other race alone, not Hispanic	0.2%±0.2 pts	0.4%	–
Born outside the United States	3.1%±0.5 pts	4.1%	+0.8 pts
Speak a language other than English at home (age 5+)	4.2%±0.9 pts	6.0%	–
Civilian veterans (age 18+)	8.7%±1.0 pts	8.4%	–
With a disability	13.0%±1.2 pts	15.8%	–
No health insurance coverage	5.5%±0.9 pts	6.2%	−3.9 pts
High school graduate or higher (age 25+)	94.8%±1.1 pts	94.8%	–
Bachelor's degree or higher (age 25+)	39.7%±1.8 pts	36.2%	+6.2 pts
Graduate or professional degree (age 25+)	15.3%±1.6 pts	13.7%	–
Moved from another state in the past year	3.1%±0.8 pts	2.7%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov

What do households in Knox County earn?

Half of Knox County's 18,484 households earn less than $74,096 a year (±$3,739), against $74,733 in Maine. In 2015-2019 it was $71,074 in 2024 dollars; the margins of error cannot tell the two periods apart. 8.2% of residents live below the poverty line.

Income and poverty in 2024 dollars, ACS 2020-2024 5-year estimates
Measure	Knox County	Maine	Change since 2015-2019
Median household income	$74,096±$3,739	$74,733	no clear change
Mean household income	$99,101±$4,296	$100,102	–
Per capita income	$44,763±$1,917	$43,742	+$3,995
People below the poverty line	8.2%±1.3 pts	10.7%	no clear change
Children under 18 below the poverty line	6.4%±2.6 pts	13.1%	−9.3 pts
Households receiving SNAP	8.5%±1.7 pts	12.0%	–
Households with a broadband subscription	90.3%±1.8 pts	90.3%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What does housing cost in Knox County?

Owners occupy 78.7% of Knox County's occupied homes and renters 21.3%. The median owner-occupied home is valued at $324,900 by its owner (±$14,707). The median renter pays $1,165 a month including utilities, and 36.3% of renters pay 35% or more of their income on rent.

Housing, ACS 2020-2024 5-year estimates
Measure	Knox County	Maine	Change since 2015-2019
Median home value (owner-occupied)	$324,900±$14,707	$296,600	+$62,270
Median gross rent	$1,165±$70	$1,139	+$112
Renters paying 35% or more of income on rent	36.3%±7.7 pts	37.9%	no clear change
Median monthly owner costs, with a mortgage	$1,691±$84	$1,729	–
Owner-occupied homes	78.7%±2.2 pts	74.3%	no clear change
Housing units	24,564±110	751,876	+164
Homeowner vacancy rate	0.9%±0.8 pts	0.7%	–
Rental vacancy rate	3.3%±2.2 pts	4.2%	–
Single-family detached homes	79.4%±1.9 pts	70.0%	–
Mobile homes	5.8%±1.1 pts	8.2%	–
Built 2020 or later	0.6%±0.3 pts	1.4%	–
Built 1939 or earlier	32.9%±2.5 pts	22.9%	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov

How many new homes is Knox County building?

Builders took permits for 191 new housing units across Knox County in 2025 (125 single-family), 4.6 per 1,000 residents.

2019 114 units
2020 136 units
2021 154 units
2022 210 units
2023 153 units
2024 166 units
2025 191 units

Source: Building Permits Survey, annual county files 2019-2025, U.S. Census Bureau · Census Building Permits Survey

How do people in Knox County get to work?

68.8% of Knox County's workers drive alone and 16.6% work from home. The average trip to work takes 19.6 minutes. The unemployment rate in 2020-2024 averaged 3.9%.

Work and commuting, ACS 2020-2024 5-year estimates
Measure	Knox County	Maine	Change since 2015-2019
In the labor force (age 16+)	58.1%±1.7 pts	61.7%	–
Unemployment rate	3.9%±1.1 pts	3.8%	no clear change
Drove alone to work	68.8%±3.0 pts	70.8%	–
Carpooled	9.4%±2.2 pts	7.9%	–
Public transportation	0.1%±0.1 pts	0.5%	–
Walked	3.5%±0.9 pts	3.4%	–
Worked from home	16.6%±2.5 pts	15.9%	+9.8 pts
Mean travel time to work	19.6 min±1.1	24.6 min	no clear change

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov

What are Knox County's census tracts?

Knox County is divided into 13 census tracts. Among those with a reliable estimate, median household income runs from $42,427 (Tract 9706) to $89,155 (Tract 9709).

Census tracts of Knox County, ACS 2020-2024 5-year estimates; sort by any column

Tract 970223013970200	Camden (66%)	5,232	5,242±15	$82,344	$520,600	$1,269	9.0%
Tract 9703.0123013970301	–	3,109	3,108±238	$75,673	$303,900	$1,133	7.2%
Tract 9703.0223013970302	–	3,975	4,287±285	$74,815	$237,900	$1,107	12.1%
Tract 9704.0123013970401	–	4,865	4,932±17	$74,616	$232,700	$1,125	6.0%
Tract 9704.0223013970402	Thomaston (59%)	2,739	2,769±20	$56,435	$271,700	$1,262	6.6%
Tract 970523013970500	–	3,644	3,675±18	$86,979	$469,000	$1,194	5.3%
Tract 970623013970600	Rockland	2,526	2,391±297	$42,427	$235,700	$1,120	11.5%
Tract 970723013970700	Rockland	4,410	4,644±294	$59,836	$279,300	$1,063	9.8%
Tract 970823013970800	–	3,015	2,863±251	$87,201	$369,500	$1,132	5.0%
Tract 970923013970900	–	2,594	2,606±21	$89,155	$356,300	$1,465	7.7%
Tract 971023013971000	–	2,644	2,673±240	$80,125	$347,300	$1,436	8.8%
Tract 971123013971100	–	1,854	1,813±185	$74,155	$434,700	$970	7.4%
Tract 990023013990000	Rockland (8%)	0	0±11	not published	not published	not published	–

Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Check it at data.census.gov

How does Knox County compare with Maine's other counties?

Knox County's rank among Maine's counties with a reliable estimate (1 = highest)
Measure	Rank
Population	10th of 16
Growth 2020-2025	14th of 16
Residents per square mile	6th of 16
Median household income	5th of 16
Median home value	5th of 16
Median gross rent	3rd of 16
Poverty rate	13th of 16
Bachelor's degree or higher	5th of 16
Median age	3rd of 16

Every county in Maine

Source: PlainCities ranks from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections

Not on this page: crime, weather and schools for Knox County are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.