Demographics of Seymour town, Connecticut

Seymour town, Connecticut had 17,153 people on July 1, 2025, by the Census Bureau’s estimate: +440 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Seymour town, in four figures

17,153
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 16,889 ±24.; +2.6%
Change since July 2020: +440 people.; 41.6 ±3.0
Median age: ACS 2020–⁠2024.; $107,708 ±$14,986
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.

Seymour town, Connecticut's population grew 2.6% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Seymour 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

Seymour town, Connecticut's population grew 2.6% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Seymour 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	16,713	100.0	100.0
2021	16,780	100.4	100.2
2022	16,824	100.7	100.7
2023	17,012	101.8	101.6
2024	17,110	102.4	102.5
2025	17,153	102.6	103.1

Population of Seymour town, Connecticut on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	16,713	—
2021	16,780	+67
2022	16,824	+44
2023	17,012	+188
2024	17,110	+98
2025	17,153	+43

Age, 2020–2024

The median age is 41.6 ±3.0: for men 40.6 ±3.2 and for women 43.5 ±6.3. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Seymour town by age, ACS 2020–2024
Age	People	Share	Connecticut	United States
Under 5	769 ±253	4.6% ±1.5	5.0% ±<0.1	5.6% ±<0.1
5 to 17	2,493 ±603	14.8% ±3.6	15.2% ±0.1	16.3% ±<0.1
18 to 24	1,305 ±411	7.7% ±2.4	9.3% ±0.1	9.1% ±<0.1
25 to 44	4,276 ±576	25.3% ±3.4	25.3% ±0.1	26.9% ±<0.1
45 to 64	5,207 ±611	30.8% ±3.6	26.7% ±0.1	24.8% ±<0.1
65 and over	2,839 ±398	16.8% ±2.4	18.5% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $107,708 ±$14,986, and income per person $48,586 ±$3,620, 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 Seymour town by income, ACS 2020–2024
Household income	Households	Share	Connecticut	United States
Under $25,000	505 ±182	7.9% ±2.8	12.9% ±0.3	14.6% ±<0.1
$25,000 to $49,999	837 ±313	13.1% ±4.8	13.7% ±0.3	16.7% ±<0.1
$50,000 to $74,999	727 ±214	11.4% ±3.3	13.3% ±0.3	15.5% ±<0.1
$75,000 to $99,999	929 ±282	14.6% ±4.3	11.9% ±0.3	12.6% ±<0.1
$100,000 to $149,999	1,340 ±303	21.0% ±4.6	17.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	878 ±268	13.8% ±4.1	11.3% ±0.2	9.6% ±<0.1
$200,000 or more	1,162 ±289	18.2% ±4.4	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 Seymour town by age, ACS 2020–2024
Age	Below poverty	Rate	Connecticut	United States
All ages	1,126 ±404	6.7% ±2.4	10.0% ±0.2	12.5% ±0.1
Under 18	55 to 391	1.9% to 12.0%	13.0% ±0.5	16.1% ±0.1
18 to 59	565 ±233	6.1% ±2.5	9.4% ±0.3	11.6% ±0.1
60 and over	128 to 548	3.1% to 12.8%	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 Seymour town, ACS 2020–2024
Measure	Seymour town	Connecticut	United States
Housing units	6,551 ±366	1,541,822 ±276	143,775,355 ±10,234
Occupied	97.4% ±1.7	93.0% ±0.2	89.9% ±0.1
Vacant	1.2% to 4.0%	7.0% ±0.2	10.1% ±0.1
Owner occupied	74.2% ±4.4	66.5% ±0.4	65.2% ±0.3
Renter occupied	25.8% ±5.9	33.5% ±0.3	34.8% ±0.1
Median home value	$370,000 ±$19,407	$366,900 ±$1,621	$332,700 ±$236
Median gross rent	$1,608 ±$86	$1,488 ±$10	$1,413 ±$2
Median year built	1973 ±4	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 Seymour town by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Connecticut	United States
Hispanic or Latino	2,845 ±609	16.8% ±3.6	18.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	10,668 ±1,133	63.2% ±6.7	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	1,905 ±839	11.3% ±5.0	9.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	187 to 555	1.1% to 3.3%	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 43	0% to 0.3%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	0 to 147	0% to 0.9%	0.9% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	1,022 ±417	6.1% ±2.5	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 Seymour town by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Connecticut	United States
Born in the state	11,144 ±800	66.0% ±4.7	53.3% ±0.3	57.3% ±<0.1
Born in another state	3,299 ±754	19.5% ±4.5	27.1% ±0.2	26.9% ±<0.1
Born a citizen outside the states	176 to 648	1.0% to 3.8%	3.9% ±0.1	1.7% ±<0.1
Born abroad	2,034 ±504	12.0% ±3.0	15.7% ±0.2	14.1% ±<0.1
Naturalized citizens	1,385 ±442	8.2% ±2.6	8.7% ±0.1	7.4% ±<0.1
Not citizens	649 ±249	3.8% ±1.5	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%.

Seymour town among the places and towns of Connecticut

74th 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 Seymour town in population, ACS 2020–2024
Place	ACS 2020–⁠2024
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
Wolcott town	16,279 ±44
Suffield town	15,702 ±24
Colchester town	15,648 ±29
Ledyard town	15,433 ±38

Rankings this appears in

No. 16 Places in Connecticut by Hispanic or Latino share
No. 25 Places in Connecticut by poverty rate
No. 27 Places in Connecticut by median age
No. 29 Places in Connecticut by foreign-born share
No. 32 Places in Connecticut by median rent
No. 33 Places in Connecticut by median household income

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