Demographics of Groton city, Connecticut

Groton city, Connecticut had 10,160 people on July 1, 2025, by the Census Bureau’s estimate: +795 since July 2020. Age, income, poverty, housing and origin below come from the survey, averaged over 2020–2024, each with its margin of error.

Groton city, in four figures

10,160
Population: July 1, 2025, Vintage 2025 estimate. The survey’s 2020–⁠2024 figure is 9,490 ±34.; +8.5%
Change since July 2020: +795 people.; 39.0 ±3.7
Median age: ACS 2020–⁠2024.; $79,577 ±$8,253
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 place, so the change is the difference between one July estimate and the next.

Groton city, Connecticut's population grew 8.5% from July 2020 to July 2025, against +3.1% nationally

The July 1 estimate of Groton city, 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

Groton city, Connecticut's population grew 8.5% from July 2020 to July 2025, against +3.1% nationally. The July 1 estimate of Groton city, 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	9,365	100.0	100.0
2021	9,355	99.9	100.2
2022	9,315	99.5	100.7
2023	9,312	99.4	101.6
2024	10,163	108.5	102.5
2025	10,160	108.5	103.1

Population of Groton city, Connecticut on July 1 of each year, Vintage 2025
July 1	Population	Change
2020	9,365	—
2021	9,355	−10
2022	9,315	−40
2023	9,312	−3
2024	10,163	+851
2025	10,160	−3

Age, 2020–2024

The median age is 39.0 ±3.7: for men 38.0 ±6.2 and for women 40.8 ±5.5. Shares are of everyone the survey counts, in the Bureau’s sex-by-age table (B01001).

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People in Groton city by age, ACS 2020–2024
Age	People	Share	Connecticut	United States
Under 5	463 ±219	4.9% ±2.3	5.0% ±<0.1	5.6% ±<0.1
5 to 17	1,024 ±255	10.8% ±2.7	15.2% ±0.1	16.3% ±<0.1
18 to 24	1,317 ±319	13.9% ±3.4	9.3% ±0.1	9.1% ±<0.1
25 to 44	2,481 ±368	26.1% ±3.9	25.3% ±0.1	26.9% ±<0.1
45 to 64	2,668 ±443	28.1% ±4.7	26.7% ±0.1	24.8% ±<0.1
65 and over	1,537 ±260	16.2% ±2.7	18.5% ±0.1	17.2% ±<0.1

Income and poverty, 2020–2024

Median household income is $79,577 ±$8,253, and income per person $45,619 ±$5,401, 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 Groton city by income, ACS 2020–2024
Household income	Households	Share	Connecticut	United States
Under $25,000	899 ±317	19.3% ±6.7	12.9% ±0.3	14.6% ±<0.1
$25,000 to $49,999	697 ±218	15.0% ±4.6	13.7% ±0.3	16.7% ±<0.1
$50,000 to $74,999	518 ±157	11.1% ±3.3	13.3% ±0.3	15.5% ±<0.1
$75,000 to $99,999	928 ±246	19.9% ±5.1	11.9% ±0.3	12.6% ±<0.1
$100,000 to $149,999	756 ±200	16.2% ±4.2	17.7% ±0.3	17.5% ±<0.1
$150,000 to $199,999	398 ±142	8.6% ±3.0	11.3% ±0.2	9.6% ±<0.1
$200,000 or more	458 ±174	9.8% ±3.7	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 Groton city by age, ACS 2020–2024
Age	Below poverty	Rate	Connecticut	United States
All ages	1,764 ±520	18.6% ±5.5	10.0% ±0.2	12.5% ±0.1
Under 18	300 to 962	43.1% ±19.4	13.0% ±0.5	16.1% ±0.1
18 to 59	989 ±306	17.9% ±5.3	9.4% ±0.3	11.6% ±0.1
60 and over	62 to 226	2.6% to 9.0%	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 Groton city, ACS 2020–2024
Measure	Groton city	Connecticut	United States
Housing units	5,126 ±299	1,541,822 ±276	143,775,355 ±10,234
Occupied	90.8% ±2.1	93.0% ±0.2	89.9% ±0.1
Vacant	9.2% ±3.1	7.0% ±0.2	10.1% ±0.1
Owner occupied	45.4% ±5.9	66.5% ±0.4	65.2% ±0.3
Renter occupied	54.6% ±5.7	33.5% ±0.3	34.8% ±0.1
Median home value	$306,600 ±$25,626	$366,900 ±$1,621	$332,700 ±$236
Median gross rent	$1,250 ±$98	$1,488 ±$10	$1,413 ±$2
Median year built	1971 ±3	1967 ±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 Groton city by Hispanic origin and race, ACS 2020–2024
Origin	People	Share	Connecticut	United States
Hispanic or Latino	1,175 ±447	12.4% ±4.7	18.3% ±<0.1	19.3% ±<0.1
White alone, not Hispanic	6,362 ±535	67.0% ±5.6	61.9% ±0.1	57.4% ±<0.1
Black alone, not Hispanic	365 to 1,145	3.8% to 12.1%	9.8% ±0.1	11.9% ±<0.1
Asian alone, not Hispanic	273 to 865	2.9% to 9.1%	4.7% ±<0.1	5.9% ±<0.1
American Indian and Alaska Native alone, not Hispanic	0 to 19	0% to 0.2%	0.1% ±<0.1	0.5% ±<0.1
Native Hawaiian and Other Pacific Islander alone, not Hispanic	0 to 19	0% to 0.2%	< 0.1% ±<0.1	0.2% ±<0.1
Some other race alone, not Hispanic	1 to 123	< 0.1% to 1.3%	0.9% ±0.1	0.6% ±<0.1
Two or more races, not Hispanic	560 ±226	5.9% ±2.4	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 Groton city by place of birth and citizenship, ACS 2020–2024
Born	People	Share	Connecticut	United States
Born in the state	4,828 ±502	50.9% ±5.3	53.3% ±0.3	57.3% ±<0.1
Born in another state	3,636 ±437	38.3% ±4.6	27.1% ±0.2	26.9% ±<0.1
Born a citizen outside the states	50 to 418	0.5% to 4.4%	3.9% ±0.1	1.7% ±<0.1
Born abroad	792 ±292	8.3% ±3.1	15.7% ±0.2	14.1% ±<0.1
Naturalized citizens	384 ±178	4.0% ±1.9	8.7% ±0.1	7.4% ±<0.1
Not citizens	171 to 645	1.8% to 6.8%	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%.

Groton city among the places and towns of Connecticut

110th 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 Groton city in population, ACS 2020–2024
Place	ACS 2020–⁠2024
Canton town	10,144 ±27
Kensington CDP	9,962 ±746
Sandy Hook CDP	9,863 ±864
Woodbury town	9,833 ±20
Burlington town	9,680 ±28
Groton city	9,490 ±34
Prospect town	9,458 ±36
Portland town	9,434 ±18
Thompson town	9,337 ±19
Putnam town	9,292 ±36
Oakville CDP	9,276 ±1,015

Rankings this appears in

No. 3 Places in Connecticut by poverty rate
No. 21 Places in Connecticut by Hispanic or Latino share
No. 51 Places in Connecticut by foreign-born share
No. 56 Places in Connecticut by median age
No. 80 Places in Connecticut by median rent
No. 85 Places in Connecticut by per capita 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