Groton

County:: Brown County
County Seat:: No
Area (mi²):: 1.751
State:: South Dakota

Groton is a city located in Brown County, South Dakota. Groton has a 2025 population of 1,334. Groton is currently declining at a rate of -0.74% annually and its population has decreased by -3.75% since the most recent census, which recorded a population of 1,386 in 2020.

The average household income in Groton is $100,274 with a poverty rate of 3.88%.The median age in Groton is 34 years: 33.6 years for males, and 34.5 years for females.

Demographics

The racial composition of Groton includes 91.08% White, 4.96% other race, and smaller percentages for Asian, Two or more races and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	1,634	91.08%
Other race	89	4.96%
Asian	43	2.4%
Two or more races	28	1.56%

Groton Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Groton's average per capita income is $56,492. Household income levels show a median of $82,083. The poverty rate stands at 3.88%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.

Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.

Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.

Name	Median	Mean
Married Families	$119,028	-
Families	$113,068	$121,153
Households	$82,083	$100,274
Non Families	$37,500	$52,685

$56,492

Average Income

$82,083

Median Household Income

3.88%

Poverty Rate