Demographics of Killingly town, Connecticut

Killingly town, Connecticut had 18,177 people on July 1, 2025, by the Census Bureau’s estimate: +493 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Killingly town, in four figures

18,177
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 17,867 ±21.; +2.8%
Change since July 2020: +493 people.; 39.5 ±3.0
Median age: ACS 2020–⁠2024.; $84,350 ±$8,277
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.

Killingly town, Connecticut's population grew 2.8% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Killingly 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).

U.S. Census Bureau — Census Bureau population estimates — incorporated places and New England towns

About this chart

The figures

Killingly town, Connecticut's population grew 2.8% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Killingly 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	17,684	100.0	100.0
2021	17,722	100.2	100.2
2022	17,795	100.6	100.7
2023	17,930	101.4	101.6
2024	18,073	102.2	102.5
2025	18,177	102.8	103.1

Population of Killingly town, Connecticut on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	17,684	—
2021	17,722	+38
2022	17,795	+73
2023	17,930	+135
2024	18,073	+143
2025	18,177	+104

Age, 2020–2024

The median age is 39.5 ±3.0: for men 38.8 ±3.0 and for women 40.3 ±3.8. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Killingly town by age, ACS 2020–2024
Age	People	Share	Connecticut	United States
Under 5	920 ±173	5.1% ±1.0	5.0% ±<0.1	5.6% ±<0.1
5 to 17	2,609 ±380	14.6% ±2.1	15.2% ±0.1	16.3% ±<0.1
18 to 24	989 ±241	5.5% ±1.3	9.3% ±0.1	9.1% ±<0.1
25 to 44	5,786 ±628	32.4% ±3.5	25.3% ±0.1	26.9% ±<0.1
45 to 64	4,038 ±491	22.6% ±2.7	26.7% ±0.1	24.8% ±<0.1
65 and over	3,525 ±426	19.7% ±2.4	18.5% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $84,350 ±$8,277, and income per person $40,277 ±$2,570, 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 Killingly town by income, ACS 2020–2024
Household income	Households	Share	Connecticut	United States
Under $25,000	1,002 ±256	13.7% ±3.5	12.9% ±0.3	14.6% ±<0.1
$25,000 to $49,999	937 ±268	12.8% ±3.6	13.7% ±0.3	16.7% ±<0.1
$50,000 to $74,999	1,362 ±273	18.7% ±3.7	13.3% ±0.3	15.5% ±<0.1
$75,000 to $99,999	935 ±210	12.8% ±2.8	11.9% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,663 ±353	22.8% ±4.8	17.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	806 ±214	11.0% ±2.9	11.3% ±0.2	9.6% ±<0.1
$200,000 or more	595 ±154	8.2% ±2.1	19.2% ±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 Killingly town by age, ACS 2020–2024
Age	Below poverty	Rate	Connecticut	United States
All ages	2,023 ±624	11.4% ±3.5	10.0% ±0.2	12.5% ±0.1
Under 18	631 ±299	17.9% ±8.1	13.0% ±0.5	16.1% ±0.1
18 to 59	961 ±300	10.1% ±3.1	9.4% ±0.3	11.6% ±0.1
60 and over	431 ±168	9.2% ±3.5	8.9% ±0.3	11.0% ±<0.1

Housing, 2020–2024

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Housing in Killingly town, ACS 2020–2024
Measure	Killingly town	Connecticut	United States
Housing units	7,678 ±282	1,541,822 ±276	143,775,355 ±10,234
Occupied	95.1% ±0.9	93.0% ±0.2	89.9% ±0.1
Vacant	2.4% to 7.4%	7.0% ±0.2	10.1% ±0.1
Owner occupied	71.6% ±3.8	66.5% ±0.4	65.2% ±0.3
Renter occupied	28.4% ±4.5	33.5% ±0.3	34.8% ±0.1
Median home value	$288,600 ±$15,229	$366,900 ±$1,621	$332,700 ±$236
Median gross rent	$1,044 ±$141	$1,488 ±$10	$1,413 ±$2
Median year built	1968 ±3	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 Killingly town by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Connecticut	United States
Hispanic or Latino	971 ±470	5.4% ±2.6	18.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	15,302 ±574	85.6% ±3.2	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	219 to 701	1.2% to 3.9%	9.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	67 to 225	0.4% to 1.3%	4.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 21	0% to 0.1%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 39	0% to 0.2%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	67 to 271	0.4% to 1.5%	0.9% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	806 ±261	4.5% ±1.5	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 Killingly town by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Connecticut	United States
Born in the state	8,917 ±954	49.9% ±5.3	53.3% ±0.3	57.3% ±<0.1
Born in another state	7,959 ±838	44.5% ±4.7	27.1% ±0.2	26.9% ±<0.1
Born a citizen outside the states	11 to 131	0.1% to 0.7%	3.9% ±0.1	1.7% ±<0.1
Born abroad	453 to 1,387	2.5% to 7.8%	15.7% ±0.2	14.1% ±<0.1
Naturalized citizens	393 ±168	2.2% ±0.9	8.7% ±0.1	7.4% ±<0.1
Not citizens	112 to 942	0.6% to 5.3%	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%.

Killingly town among the places and towns of Connecticut

70th 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 Killingly town in population, ACS 2020–2024
Place	ACS 2020–⁠2024
East Lyme town	18,721 ±47
Stonington town	18,478 ±24
Wallingford Center CDP	18,208 ±1,034
Willimantic CDP	18,096 ±642
Montville town	17,950 ±45
Killingly town	17,867 ±21
Brookfield town	17,706 ±50
Madison town	17,616 ±30
Plainville town	17,551 ±27
Seymour town	16,889 ±24
Ellington town	16,455 ±26

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

Data retrieved September 25, 2026