Demographics of Kennebec County, Maine

Kennebec County, Maine had 129,067 people on July 1, 2025, by the Census Bureau’s estimate: +4,335 since July 2020. Age, income, poverty, housing and origin below come from the American Community Survey, averaged over 2020–2024, each with its margin of error.

Kennebec County, in four figures

129,067
Population: July 1, 2025, Vintage 2025 estimate.; +3.5%
Change since July 2020: +4,335 people.; 43.7 ±0.3
Median age: ACS 2020–⁠2024.; $69,077 ±$2,603
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. Each year's change is births less deaths, net moves from abroad and net moves from elsewhere in the country, with the Bureau's small residual. The 2020 row's components run 3 months, from the April census to July 1.

Kennebec County, Maine's population grew 3.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Kennebec County, Maine's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).

U.S. Census Bureau — Census Bureau population estimates — counties and Puerto Rico municipios, with components of change

About this chart

The figures

Kennebec County, Maine's population grew 3.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Kennebec County, Maine's resident population and the nation's, each year of the Census Bureau's Vintage 2025, as a share of its July 2020 level (= 100).
July 1	Population	Index	United States
2020	124,732	100.0	100.0
2021	125,803	100.9	100.2
2022	127,182	102.0	100.7
2023	128,254	102.8	101.6
2024	128,672	103.2	102.5
2025	129,067	103.5	103.1

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Population of Kennebec County, Maine on July 1 of each year, Vintage 2025
July 1	Population	Change	Births less deaths	From abroad	From elsewhere in the country
2020	124,732	+217	−87	+2	+298
2021	125,803	+1,071	−385	+49	+1,389
2022	127,182	+1,379	−583	+215	+1,672
2023	128,254	+1,072	−507	+439	+1,139
2024	128,672	+418	−569	+381	+614
2025	129,067	+395	−539	+215	+718

Age, 2020–2024

The median age is 43.7 ±0.3: for men 42.2 ±0.7 and for women 44.7 ±0.2. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Kennebec County by age, ACS 2020–2024
Age	People	Share	Maine	United States
Under 5	5,851 ±124	4.6% ±0.1	4.5% ±<0.1	5.6% ±<0.1
5 to 17	17,888 ±586	14.1% ±0.5	13.6% ±0.2	16.3% ±<0.1
18 to 24	11,543 ±667	9.1% ±0.5	8.0% ±0.1	9.1% ±<0.1
25 to 44	30,169 ±777	23.8% ±0.6	24.2% ±0.2	26.9% ±<0.1
45 to 64	34,551 ±817	27.2% ±0.6	27.4% ±0.2	24.8% ±<0.1
65 and over	26,806 ±915	21.1% ±0.7	22.4% ±0.2	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $69,077 ±$2,603, and income per person $38,597 ±$1,065, in 2024 dollars. The median is $74,733 ±$795 in Maine and $80,734 ±$166 in the United States.

Households by income

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Households in Kennebec County by income, ACS 2020–2024
Household income	Households	Share	Maine	United States
Under $25,000	8,304 ±741	15.3% ±1.4	15.0% ±0.4	14.6% ±<0.1
$25,000 to $49,999	11,466 ±803	21.1% ±1.5	18.4% ±0.4	16.7% ±<0.1
$50,000 to $74,999	9,429 ±733	17.4% ±1.3	16.8% ±0.4	15.5% ±<0.1
$75,000 to $99,999	7,191 ±692	13.2% ±1.3	13.0% ±0.4	12.6% ±<0.1
$100,000 to $149,999	10,396 ±811	19.1% ±1.5	18.4% ±0.4	17.5% ±<0.1
$150,000 to $199,999	3,939 ±473	7.3% ±0.9	9.1% ±0.3	9.6% ±<0.1
$200,000 or more	3,587 ±489	6.6% ±0.9	9.4% ±0.3	13.4% ±0.1

Poverty by age

The poverty rate is the share of people whose family income is below the federal threshold for their family’s size, of everyone for whom the Bureau determines it (B17020).

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Poverty rate in Kennebec County by age, ACS 2020–2024
Age	Below poverty	Rate	Maine	United States
All ages	14,256 ±1,417	11.6% ±1.2	10.7% ±0.3	12.5% ±0.1
Under 18	3,524 ±638	15.1% ±2.7	13.1% ±0.7	16.1% ±0.1
18 to 59	7,260 ±847	11.4% ±1.3	10.5% ±0.3	11.6% ±0.1
60 and over	3,472 ±420	9.8% ±1.2	9.7% ±0.4	11.0% ±<0.1

Housing, 2020–2024

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Housing in Kennebec County, ACS 2020–2024
Measure	Kennebec County	Maine	United States
Housing units	63,521 ±59	751,876 ±671	143,775,355 ±10,234
Occupied	85.5% ±1.0	79.4% ±0.3	89.9% ±0.1
Vacant	14.5% ±1.0	20.6% ±0.3	10.1% ±0.1
Owner occupied	73.7% ±1.5	74.3% ±0.5	65.2% ±0.3
Renter occupied	26.3% ±1.6	25.7% ±0.4	34.8% ±0.1
Median home value	$238,200 ±$5,239	$296,600 ±$2,876	$332,700 ±$236
Median gross rent	$992 ±$43	$1,139 ±$13	$1,413 ±$2
Median year built	1975 ±1	1977 ±1	1980 ±1

Occupied and vacant are shares of all housing units; owner and renter occupied are shares of occupied units. Value and rent are medians in 2024 dollars.

Origin and place of birth, 2020–2024

Hispanic or Latino origin is not a race in the Census Bureau’s tables. Here the people of Hispanic origin, of any race, are one row, and everyone else is counted by race alone (B03002), so the rows add to the whole.

Hispanic origin and race

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People in Kennebec County by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Maine	United States
Hispanic or Latino	2,861 ±0	2.3% ±<0.1	2.2% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	116,399 ±517	91.8% ±0.4	89.9% ±0.2	57.4% ±<0.1
Black alone, not Hispanic	1,080 ±162	0.9% ±0.1	1.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	1,129 ±185	0.9% ±0.1	1.1% ±0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	73 to 319	0.1% to 0.3%	0.3% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 3	0% to < 0.1%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	220 to 690	0.2% to 0.5%	0.4% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	4,687 ±490	3.7% ±0.4	4.2% ±0.2	4.3% ±<0.1

A range (the estimate less and plus its margin) where the Bureau's estimate is too uncertain to state as one number: a coefficient of variation over 30%.

Place of birth and citizenship

“Born a citizen outside the states” counts people born in Puerto Rico, the island areas, or abroad to American parents. Naturalized citizens and those who are not citizens together make up the people born abroad (B05002).

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People in Kennebec County by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Maine	United States
Born in the state	87,820 ±1,730	69.3% ±1.4	59.6% ±0.4	57.3% ±<0.1
Born in another state	34,656 ±1,707	27.3% ±1.3	35.2% ±0.3	26.9% ±<0.1
Born a citizen outside the states	1,236 ±266	1.0% ±0.2	1.1% ±0.1	1.7% ±<0.1
Born abroad	3,096 ±388	2.4% ±0.3	4.1% ±0.1	14.1% ±<0.1
Naturalized citizens	1,738 ±325	1.4% ±0.3	2.1% ±0.1	7.4% ±<0.1
Not citizens	1,358 ±292	1.1% ±0.2	1.9% ±0.1	6.8% ±<0.1

Kennebec County among the counties of Maine

4th of 16 by population, July 2025. Every one is listed on the Maine page.

Counties of Maine near Kennebec County in population, July 2025
County	July 2025	Change since 2020
Cumberland County	317,222	+4.5%
York County	222,434	+4.8%
Penobscot County	157,967	+3.8%
Kennebec County	129,067	+3.5%
Androscoggin County	116,487	+4.8%
Aroostook County	66,609	−0.7%
Oxford County	60,346	+4.2%
Hancock County	57,171	+3.0%
Somerset County	51,620	+2.3%

Elsewhere on the site

Sources

Census Bureau population estimates — counties and Puerto Rico municipios, with components of change — U.S. Census Bureau · U.S. Government work · retrieved September 25, 2026
American Community Survey 5-year estimates — table-based Summary File · U.S. Government work

Data retrieved September 25, 2026