Town · Connecticut
Groton, Connecticut
Groton, town, in Southeastern Connecticut Planning Region, Connecticut. Groton had 39,138 residents on July 1, 2025 by the Census Bureau's estimate, up 1.9% since 2020; the 2020 Census counted 38,411 and the ACS 2020-2024 5-year estimates put it at 38,130 (±86). GEOID 0918034250.
Residents, July 2025 estimate
39,138
Census Bureau estimate (no margin published)
2020 Census count: 38,411 · ACS 2020-2024: 38,130 ±86
Median household income
$88,284
±$5,289 (90% margin)
Connecticut: $95,781
Median home value
$340,100
±$17,454 (90% margin)
Connecticut: $366,900
Median gross rent
$1,602
±$55 (90% margin)
Connecticut: $1,488
Where is Groton and what county is it in?
Groton is a town in Southeastern Connecticut Planning Region, Connecticut. It covers 31.1 square miles of land, 1,235 residents per square mile in 2020.
7 places lie inside Groton: Groton (city, 9,387 in 2020), Conning Towers-Nautilus Park (CDP, 8,870 in 2020), Long Hill (Southeastern Connecticut County) (CDP, 3,948 in 2020), Old Mystic (CDP, 3,493 in 2020), Poquonock Bridge (CDP, 1,686 in 2020), Noank (CDP, 1,654 in 2020) and Groton Long Point (borough, 530 in 2020). Part of Mystic (CDP) also lies in it.
Groton is in the Norwich-New London-Willimantic, CT metropolitan statistical area (Census Bureau delineation, July 2023).
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Groton, and is it growing?
The Census Bureau estimates that 39,138 people lived in Groton on July 1, 2025, up 1.9% since 2020, in line with Connecticut (+2.2%). The 2020 Census counted 38,411 residents. The 2020-2024 American Community Survey, a five-year sample, puts the population at 38,130 (±86).
| Measure | Groton | Southeastern Connecticut Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Total population | 38,130±86 | 279,971 | – |
| Households | 16,374±541 | 115,768 | – |
| Average household size | 2.22±0.07 | 2.32 | – |
| Housing units | 18,155±543 | 126,425 | – |
Groton's population since 2000
From 39,907 in 2000 to 39,138 in 2025: down 1.9%. The 2000, 2010 and 2020 figures are census counts, each for Groton as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Groton?
The median resident of Groton is 36.8 years old; 18.4% are under 18 and 19.5% are 65 or older. The largest group is non-Hispanic white residents at 69.9%, then Hispanic or Latino residents (of any race) at 12.1%. 8.3% of residents were born outside the United States.
| Measure | Groton | Southeastern Connecticut Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median age | 36.8±2.1 | 41.1 | – |
| Under 18 years | 18.4%±1.4 pts | 19.3% | – |
| 65 years and over | 19.5%±1.5 pts | 19.5% | – |
| Male | 53.0%±1.4 pts | 50.0% | – |
| Hispanic or Latino (any race) | 12.1%±1.9 pts | 15.0% | – |
| White alone, not Hispanic | 69.9%±2.5 pts | 70.6% | – |
| Black or African American alone, not Hispanic | 4.7%±1.2 pts | 4.9% | – |
| Asian alone, not Hispanic | 6.6%±1.3 pts | 3.7% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±0.1 pts | 0.3% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±0.1 pts | 0.0% | – |
| Two or more races, not Hispanic | 6.4%±1.5 pts | 4.8% | – |
| Some other race alone, not Hispanic | 0.3%±0.2 pts | 0.6% | – |
| Born outside the United States | 8.3%±1.5 pts | 8.8% | – |
| Speak a language other than English at home (age 5+) | 10.9%±1.5 pts | 15.3% | – |
| Civilian veterans (age 18+) | 10.0%±1.5 pts | 8.0% | – |
| With a disability | 15.3%±1.8 pts | 14.8% | – |
| No health insurance coverage | 4.2%±1.1 pts | 4.7% | – |
| High school graduate or higher (age 25+) | 95.0%±1.2 pts | 92.8% | – |
| Bachelor's degree or higher (age 25+) | 42.7%±2.9 pts | 35.8% | – |
| Graduate or professional degree (age 25+) | 18.8%±2.0 pts | 16.0% | – |
| Lived in the same house a year earlier | 79.3%±2.6 pts | 88.1% | – |
| Moved from another state in the past year | 9.1%±1.5 pts | 3.3% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Groton earn?
Half of Groton's 16,374 households earn less than $88,284 a year (±$5,289), against $86,586 in Southeastern Connecticut Planning Region and $95,781 in Connecticut. 10.6% of residents live below the poverty line.
| Measure | Groton | Southeastern Connecticut Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $88,284±$5,289 | $86,586 | – |
| Mean household income | $115,809±$6,985 | $111,769 | – |
| Per capita income | $51,281±$2,940 | $47,133 | – |
| People below the poverty line | 10.6%±1.9 pts | 10.7% | – |
| Children under 18 below the poverty line | 15.2%±5.4 pts | 15.1% | – |
| Households receiving SNAP | 10.9%±2.2 pts | 12.4% | – |
| Households with a computer | 96.1%±1.4 pts | 95.2% | – |
| Households with a broadband subscription | 91.0%±2.3 pts | 91.6% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Groton?
Owners occupy 53.4% of Groton's occupied homes and renters 46.6%. The median owner-occupied home is valued at $340,100 by its owner (±$17,454). The median renter pays $1,602 a month including utilities, and 38.8% of renters pay 35% or more of their income on rent.
| Measure | Groton | Southeastern Connecticut Planning Region | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $340,100±$17,454 | $323,400 | – |
| Median gross rent | $1,602±$55 | $1,365 | – |
| Renters paying 35% or more of income on rent | 38.8%±4.8 pts | 40.7% | – |
| Median monthly owner costs, with a mortgage | $2,098±$107 | $2,140 | – |
| Owner-occupied homes | 53.4%±2.9 pts | 65.1% | – |
| Renter-occupied homes | 46.6%±2.9 pts | 34.9% | – |
| Housing units | 18,155±543 | 126,425 | – |
| Homeowner vacancy rate | 1.2%±1.1 pts | 0.6% | – |
| Rental vacancy rate | 4.5%±2.3 pts | 4.4% | – |
| Single-family detached homes | 47.6%±2.7 pts | 61.1% | – |
| Mobile homes | 2.2%±0.8 pts | 2.3% | – |
| Built 2020 or later | 0.8%±0.4 pts | 0.8% | – |
| Built 2010 to 2019 | 3.2%±0.9 pts | 4.0% | – |
| Built 1939 or earlier | 15.4%±2.0 pts | 23.6% | – |
| Households with no vehicle | 7.2%±1.5 pts | 7.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How many new homes is Groton building?
Builders took permits for 20 new housing units in Groton in 2025 (16 in single-family houses), 0.5 per 1,000 residents against 2.0 across Connecticut.
Counts of units in permits a local office issued; not every permitted unit is built. A year marked with months was reported for part of the year.
Source: Building Permits Survey, annual place files 2019-2025, U.S. Census Bureau · Census Building Permits Survey
How do people in Groton work and get to work?
70.5% of Groton's workers drive alone and 13.6% work from home. The average trip to work takes 19.3 minutes. The unemployment rate in 2020-2024 averaged 5.2%.
| Measure | Groton | Southeastern Connecticut Planning Region | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 65.7%±2.1 pts | 64.0% | – |
| Unemployment rate | 5.2%±1.8 pts | 5.0% | – |
| Drove alone to work | 70.5%±3.0 pts | 75.5% | – |
| Carpooled | 7.2%±1.9 pts | 7.0% | – |
| Public transportation | 0.4%±0.3 pts | 1.4% | – |
| Walked | 6.4%±1.4 pts | 2.9% | – |
| Worked from home | 13.6%±2.4 pts | 11.7% | – |
| Mean travel time to work | 19.3 min±1.1 | 23.9 min | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Groton?
11 census tracts lie mostly in Groton (2020 census blocks). Their median household incomes run from $60,521 (Tract 7025) to $161,250 (Tract 7030).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 8702Southeastern Connecticut Planning Region | 6,126 | $81,545 |
| Tract 7027Southeastern Connecticut Planning Region | 5,047 | $82,112 |
| Tract 7021Southeastern Connecticut Planning Region | 4,575 | $128,750 |
| Tract 7025Southeastern Connecticut Planning Region | 4,562 | $60,521 |
| Tract 7028Southeastern Connecticut Planning Region | 3,764 | $70,809 |
| Tract 7030Southeastern Connecticut Planning Region | 3,577 | $161,250 |
| Tract 7024Southeastern Connecticut Planning Region | 3,448 | $83,850 |
| Tract 7029Southeastern Connecticut Planning Region | 2,385 | $144,028 |
| Tract 7023Southeastern Connecticut Planning Region | 2,135 | $81,020 |
| Tract 7026Southeastern Connecticut Planning Region | 1,279 | $130,357 |
| Tract 9800Southeastern Connecticut Planning Region | 1,232 | not published |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Groton) · Census block assignment files
How does Groton compare with other places in Connecticut?
By the Census Bureau's July 2025 estimates, Groton is the 243rd-most populous of the 16,079 U.S. towns and townships that have one and the 10th-most populous of 142 in Connecticut.
Groton ranks 224th of 294 places in Connecticut with 1,000 or more residents and a reliable estimate, by median household income.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 10th | 142 |
| Growth 2020-2025 (PEP) | 91st | 167 |
| Residents per square mile | 111th | 303 |
| Median household income | 224th | 294 |
| Per capita income | 199th | 303 |
| Median home value | 184th | 300 |
| Median gross rent | 109th | 266 |
| Poverty rate | 53rd | 202 |
| Bachelor's degree or higher | 170th | 297 |
| Median age | 274th | 301 |
| Owner-occupied share | 271st | 300 |
| Work from home | 193rd | 279 |
| Travel time to work | 289th | 302 |
Groton's figures with every place in Connecticut (CSV)
Every place in Connecticut, sortable · Compare Groton with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Groton?
5 of the 57 figures for Groton on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Groton are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.