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, Black or African American, Native American, Native Hawaiian or Pacific Islander and multiracial populations.

Population by Race

White

Other race

Asian

Two or more races

Black or African American

Native American

Native Hawaiian or Pacific Islander

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%
Black or African American	0	0%
Native American	0	0%
Native Hawaiian or Pacific Islander	0	0%

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