Demographics of Killingworth town, Connecticut

Killingworth town, Connecticut had 6,288 people on July 1, 2025, by the Census Bureau’s estimate: +128 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Killingworth town, in four figures

6,288
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 6,240 ±19.; +2.1%
Change since July 2020: +128 people.; 53.3 ±4.6
Median age: ACS 2020–⁠2024.; $140,655 ±$16,359
Median household income: ACS 2020–⁠2024, in 2024 dollars.

Population, year by year

July 1 estimates from the Census Bureau’s Vintage 2025. The Bureau publishes no births, deaths or migration for a town, so the change is the difference between one July estimate and the next.

Killingworth town, Connecticut's population grew 2.1% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Killingworth town, Connecticut'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).

Source: The Census Bureau

About this chart

The figures

Killingworth town, Connecticut's population grew 2.1% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Killingworth town, Connecticut'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	6,160	100.0	100.0
2021	6,231	101.2	100.2
2022	6,250	101.5	100.7
2023	6,271	101.8	101.6
2024	6,285	102.0	102.5
2025	6,288	102.1	103.1

Population of Killingworth town, Connecticut on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	6,160	—
2021	6,231	+71
2022	6,250	+19
2023	6,271	+21
2024	6,285	+14
2025	6,288	+3

Age, 2020–2024

The median age is 53.3 ±4.6: for men 53.3 ±6.0 and for women 54.1 ±6.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Killingworth town by age, ACS 2020–2024
Age	People	Share	Connecticut	United States
Under 5	395 ±163	6.3% ±2.6	5.0% ±<0.1	5.6% ±<0.1
5 to 17	769 ±235	12.3% ±3.8	15.2% ±0.1	16.3% ±<0.1
18 to 24	162 to 504	2.6% to 8.1%	9.3% ±0.1	9.1% ±<0.1
25 to 44	947 ±233	15.2% ±3.7	25.3% ±0.1	26.9% ±<0.1
45 to 64	2,202 ±382	35.3% ±6.1	26.7% ±0.1	24.8% ±<0.1
65 and over	1,594 ±306	25.5% ±4.9	18.5% ±0.1	17.2% ±<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%.

Income and poverty, 2020–2024

Median household income is $140,655 ±$16,359, and income per person $77,833 ±$23,187, in 2024 dollars. The median is $95,781 ±$732 in Connecticut and $80,734 ±$166 in the United States.

Households by income

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Households in Killingworth town by income, ACS 2020–2024
Household income	Households	Share	Connecticut	United States
Under $25,000	29 to 341	1.2% to 13.5%	12.9% ±0.3	14.6% ±<0.1
$25,000 to $49,999	89 to 421	3.6% to 16.7%	13.7% ±0.3	16.7% ±<0.1
$50,000 to $74,999	175 ±74	7.0% ±2.9	13.3% ±0.3	15.5% ±<0.1
$75,000 to $99,999	121 to 377	4.9% to 14.9%	11.9% ±0.3	12.6% ±<0.1
$100,000 to $149,999	556 ±208	22.1% ±8.1	17.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	365 ±140	14.5% ±5.4	11.3% ±0.2	9.6% ±<0.1
$200,000 or more	731 ±197	29.1% ±7.5	19.2% ±0.3	13.4% ±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%.

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 Killingworth town by age, ACS 2020–2024
Age	Below poverty	Rate	Connecticut	United States
All ages	28 to 344	0.4% to 5.5%	10.0% ±0.2	12.5% ±0.1
Under 18	0 to 33	0% to 2.8%	13.0% ±0.5	16.1% ±0.1
18 to 59	0 to 128	0% to 4.7%	9.4% ±0.3	11.6% ±0.1
60 and over	0 to 275	0% to 11.7%	8.9% ±0.3	11.0% ±<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%.

Housing, 2020–2024

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Housing in Killingworth town, ACS 2020–2024
Measure	Killingworth town	Connecticut	United States
Housing units	2,775 ±210	1,541,822 ±276	143,775,355 ±10,234
Occupied	90.7% ±2.2	93.0% ±0.2	89.9% ±0.1
Vacant	4.0% to 14.7%	7.0% ±0.2	10.1% ±0.1
Owner occupied	96.7% ±3.0	66.5% ±0.4	65.2% ±0.3
Renter occupied	0.5% to 6.0%	33.5% ±0.3	34.8% ±0.1
Median home value	$446,200 ±$55,937	$366,900 ±$1,621	$332,700 ±$236
Median gross rent	Not computed by the Bureau	$1,488 ±$10	$1,413 ±$2
Median year built	1987 ±6	1967 ±1	1980 ±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%.

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 Killingworth town by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Connecticut	United States
Hispanic or Latino	52 to 286	0.8% to 4.6%	18.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	5,474 ±350	87.7% ±5.6	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	0 to 19	0% to 0.3%	9.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	0 to 63	0% to 1.0%	4.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 19	0% to 0.3%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 19	0% to 0.3%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 103	0% to 1.7%	0.9% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	194 to 868	3.1% to 13.9%	4.3% ±0.1	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 Killingworth town by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Connecticut	United States
Born in the state	4,184 ±348	67.1% ±5.6	53.3% ±0.3	57.3% ±<0.1
Born in another state	1,920 ±348	30.8% ±5.6	27.1% ±0.2	26.9% ±<0.1
Born a citizen outside the states	15 to 169	0.2% to 2.7%	3.9% ±0.1	1.7% ±<0.1
Born abroad	1 to 87	< 0.1% to 1.4%	15.7% ±0.2	14.1% ±<0.1
Naturalized citizens	1 to 87	< 0.1% to 1.4%	8.7% ±0.1	7.4% ±<0.1
Not citizens	0 to 19	0% to 0.3%	7.1% ±0.2	6.8% ±<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%.

Killingworth town among the places and towns of Connecticut

149th of 168 places and towns of 5,000 or more by the survey’s 2020–2024 count. Every one is listed on the Connecticut page.

Places of Connecticut near Killingworth town in population, ACS 2020–2024
Place	ACS 2020–⁠2024
New Canaan CDP	6,896 ±992
Westbrook town	6,856 ±19
Essex town	6,794 ±28
New Hartford town	6,675 ±35
Branford Center CDP	6,305 ±655
Killingworth town	6,240 ±19
Simsbury Center CDP	6,198 ±675
Northford CDP	6,186 ±552
Cheshire Village CDP	6,172 ±599
Beacon Falls town	6,147 ±27
Marlborough town	6,130 ±33

Rankings this appears in

No. 1 Places in Connecticut by homeownership rate
No. 1 Places in Connecticut by median age
No. 3 Places by homeownership rate
No. 9 Places in Connecticut by median household income
No. 11 Places in Connecticut by per capita income
No. 26 Places in Connecticut by median home value

Sources

Census Bureau population estimates — incorporated places and New England towns — 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

Compiled automatically from Census Bureau population estimates — incorporated places and New England towns and American Community Survey 5-year estimates — table-based Summary File by a checked SQL query · Editor: Kian O'Connor · How this site is built

Data retrieved September 25, 2026