Groton, SD demographics:
population, income, and more

Total population
1,691
-5.7% year-over-year change
Median household income
$89,861/yr
9.5% year-over-year change
Housing units
694
-5.6% year-over-year change

Groton population

How many people live in Groton

Groton is home to 1,691 residents, according to the most recent Census data. Gender-wise, 51.7% of Groton locals are male, and 48.3% are female.

Total population
1,691
-5.7% year-over-year change
Gender ratio
Male
51.7%
875
Female
48.3%
816
Value Percent YoY change
Male 875 51.7% -8.5%
Female 816 48.3% -2.6%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Groton is 34, with the population distributed as follows: about 27.9% are children under 15, then 6.3% are in the 15 to 24 age group. Adults between 25 and 44 make up 30.3% of the population, while another 22.5% fall into the 45 to 64 bracket. Finally, around 13% are 65 or older.

Median age
33.9
Age breakdown
Under 15
27.9%
15 to 24
6.3%
25 to 44
30.3%
45 to 64
22.5%
Over 65
13%
Value Percent YoY change
Under 15 472 27.9% 4.4%
15 to 24 107 6.3% -21.9%
25 to 44 512 30.3% -0.4%
45 to 64 380 22.5% -1.8%
Over 65 220 13% -27.6%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Groton, 96.2% of the population are US-born citizens, while 0.7% have gained naturalized citizenship. At the same time, 3.1% of residents are non-citizens. There’s also a share of 2.4% that includes residents with two or more races.

Citizenship
U.S.-born citizens
96.2%
Non-U.S.-born citizens
0.7%
Non-citizens
3.1%
Value Percent YoY change
U.S.-born citizens 1,626 96.2% -5.1%
Non-U.S.-born citizens 12 0.7% -36.8%
Non-citizens 53 3.1% -13.1%
Racial breakdown
White
90%
Black or African American
0%
American Indian and Alaska Native
1.3%
Asian
2.1%
Native Hawaiian and other Pacific Islander
0%
Two or more races
2.4%
Other
4.1%
Value Percent
White 1,522 90%
American Indian and Alaska Native 22 1.3%
Asian 36 2.1%
Two or more races 41 2.4%
Other 70 4.1%

Households in Groton

A peek inside Groton households

Groton has 625 households, with an average of 3 members in each. Of these, 70.2% are families, while the remaining 29.8% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
625
-8.6% year-over-year change
Average people per household
3
Non-family households
186
Family households
439
Value Percent YoY change
Non-family households 186 29.8% -20.5%
Family households 439 70.2% -2.4%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Groton

The housing landscape of Groton

Groton's housing consists of 694 units, with 73% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 3.2% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 3.3% of the housing landscape.

Housing units
694
-5.6% year-over-year change
Housing types
Value Percent
1 unit, detached 507 73%
1 unit, attached 22 3.2%
2 units 22 3.2%
3 or 4 units 65 9.4%
5 to 9 units 44 6.3%
10 to 19 units 11 1.6%
Mobile home 23 3.3%
Homes built since 2020
20
-4.8% year-over-year change

The age of buildings in Groton

In Groton, the median construction year is 1975. About 29.7% of homes were built before the 1940s, with another 0.9% going up by 1949. Most development happened in the second half of the 20th century. Then, 10.5% of homes were added from 2000 to 2009, 8.5% between 2010 and 2019, and 2.9% are part of the newest wave of development.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 206 29.7% -7.6%
Built between 1940 and 1949 6 0.9% -60.0%
Built between 1950 and 1959 36 5.2% -7.7%
Built between 1960 and 1969 53 7.6% -14.5%
Built between 1970 and 1979 88 12.7% -2.2%
Built between 1980 and 1989 69 9.9% 19.0%
Built between 1990 and 1999 84 12.1% -16.0%
Built between 2000 and 2009 73 10.5% 21.7%
Built between 2010 and 2019 59 8.5% -11.9%
Built in 2020 or later 20 2.9% -4.8%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Groton occupancy rates

Out of the 625 occupied housing units in Groton, 73.1% are owner-occupied, while 26.9% are lived in by tenants. Meanwhile, 9.9% of all homes on the local market sit vacant.

Occupied housing units
625
-8.6% year-over-year change
Occupancy breakdown
Renter occupied
168
Owner occupied
457
Value Percent YoY
change
Renter occupied 168 26.9% 3.7%
Owner occupied 457 73.1% -12.4%
Unoccupied housing units
9.9%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Groton housing costs

Housing costs in Groton come to a median of $1,144 per month, while tenants specifically pay a median gross rent of $981.

Median housing costs per month
$1,144/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Groton
$981/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Groton

Groton education at a glance

About 29.1% of the population in Groton went to high school, while 18.2% pursued college studies. Another 15.3% earned an associate degree and 22.3% hold a bachelor’s. Meanwhile, 12.5% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 29 2.5% 26.1%
High school diploma 342 29.1% -21.2%
College diploma 214 18.2% -6.5%
Associate degree 180 15.3% -3.7%
Bachelor's degree 262 22.3% -4.0%
Graduate degree 147 12.5% 23.5%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Groton

How much people earn in Groton

The average annual household income in Groton was $107,886 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +7.6% change from the previous year. At the same time, the median income stood at $89,861, reflecting a +9.5% shift over the same period.

Average household income in Groton
$107,886/year
7.6% year-over-year change
Median household income in Groton
$89,861/year
9.5% year-over-year change

Groton income by age

In Groton, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $106,827. Those with someone between 45 and 64 in charge, often well established professionally, earn $116,550 overall. Younger households, where the main provider is under 25 and just starting out, report a median income of $59,875, while those led by someone over 65, many of whom may be retired, have about $48,250 in earnings. Overall, 95.6% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
Under 25 $59,875 4.9%
25 - 44 $106,827 4.9%
45 - 64 $116,550 2.5%
Over 65 $48,250 6.9%
Above poverty level
1,558
Below poverty level
72
Value Percent YoY
change
Above poverty level 1,558 95.6% -5.9%
Below poverty level 72 4.4% 5.9%

Average renter income in Groton

To get a better sense of what renters earn on average in Groton, their median household income was $52,634 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 22.4%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$52,634
Rent-to-income ratio
22.4%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Groton

Workforce and job types in Groton

The job market in Groton is powered by 866 working residents, spread across a range of industries and roles. 71.9% of the working population are employed in professional or administrative positions, while 28.1% are in hands-on or service-based jobs. Also, 17.6% run their own businesses, 63.9% are employed by private companies, and 9.1% work in the public sector.

Workforce demographics

Working population
866
-7.4% year-over-year change
White collar
623
Blue collar
243
Value Percent YoY change
White collar 623 71.9% -7.4%
Blue collar 243 28.1% -7.2%
Employer type
Self employees
17.6%
Private companies
63.9%
Governmental workers
9.1%
Not for profit companies
9.5%
Value Percent YoY change
Self employees 152 17.6% -9.5%
Private companies 553 63.9% -3.8%
Governmental workers 79 9.1% -24.8%
Not for profit companies 82 9.5% -5.8%
Unemployment rate
1.1%
42.9% year-over-year change

Available workforce

The unemployment rate in Groton stands at 1.1%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Groton

How people get around in Groton

In Groton, the average commute time is 17 minutes. Commuting methods vary: 94.7% of residents travel by personal vehicle and 1.5% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Commute time
17 min
Means of transportation
Value Percent YoY change
Car 808 94.7% -8.5%
Walk 13 1.5% -40.9%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Groton by zipcode?

Zipcode Population Number of households Median income Average income
57445 2,072 865 $84,948 $108,789

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FAQs about Groton demographics 

What is the total population of Groton?

Groton has a total population of 1,691 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by -5.7% compared to a year ago.

What is the gender ratio in Groton?

The gender ratio in Groton is as follows:
  • 51.7% males (875 residents)
  • 48.3% females (816 residents)

What is the median age in Groton?

The median age in Groton is 33.9.

What is the age distribution of the population in Groton?

The age distribution in Groton is as follows:
  • Under 15: 27.9% (472 residents)
  • Ages 15-24: 6.3% (107 residents)
  • Ages 25-44: 30.3% (512 residents)
  • Ages 45-64: 22.5% (380 residents)
  • Over 65: 13% (220 residents)

What is the racial and ethnic makeup of Groton?

The racial and ethnic makeup of Groton is as follows:
  • White: 90% (1,522 residents)
  • Black or African American: 0% (0 residents)
  • American Indian and Alaska Native: 1.3% (22 residents)
  • Asian: 2.1% (36 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 2.4% (41 residents)
  • Other: 4.1% (70 residents)

What percentage of the population in Groton are U.S.-born citizens?

U.S.-born citizens represent 96.2% of the population in Groton.

How many housing units are there in Groton?

There are 694 housing units in Groton, reflecting a -5.6% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Groton and what is the average household size?

Groton has a total of 625 households, with an average of 3 people in each.

What is the median household income in Groton?

Groton has a median household income of $89,861, representing a +9.5% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Groton?

The employment rate is 98.9% in Groton, with a workforce of 866 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 71.9% (623 residents)
  • Blue-collar workers: 28.1% (243 residents)

Places of employment:
  • Self-employed: 17.6% (152 residents)
  • Private companies: 63.9% (553 residents)
  • Governmental workers: 9.1% (79 residents)
  • Not-for-profit companies: 9.5% (82 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025