Lake Madison

County:: Lake County
County Seat:: No
Area (mi²):: 4.721
State:: South Dakota

Lake Madison is a CDP located in Lake County, South Dakota. Lake Madison has a 2025 population of 892. Lake Madison is currently growing at a rate of 1.59% annually and its population has increased by 9.99% since the most recent census, which recorded a population of 811 in 2020.

The average household income in Lake Madison is $198,189 with a poverty rate of 12.88%.The median age in Lake Madison is 61.3 years: 61.8 years for males, and 60.2 years for females.

Demographics

The racial composition of Lake Madison includes 80% White, 8.59% Native American, and smaller percentages for and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	708	80%
Two or more races	101	11.41%
Native American	76	8.59%

Lake Madison Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Lake Madison's average per capita income is $36,875. Household income levels show a median of $116,648. The poverty rate stands at 12.88%.

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	$127,500	-
Families	$121,827	$228,603
Households	$116,648	$198,189
Non Families	$87,500	$118,106

$36,875

Average Income

$116,648

Median Household Income

12.88%

Poverty Rate