Onida

County:: Sully County
County Seat:: No
Area (mi²):: 0.672
State:: South Dakota

Onida is a city located in Sully County, South Dakota. Onida has a 2025 population of 654. Onida is currently declining at a rate of -0.3% annually and its population has decreased by -1.51% since the most recent census, which recorded a population of 664 in 2020.

The average household income in Onida is $95,527 with a poverty rate of 6.58%.The median age in Onida is 46.6 years: 54.1 years for males, and 42.2 years for females.

Demographics

The racial composition of Onida includes 94.53% White, and smaller percentages for Black or African American and multiracial populations.

Population by Race

Race	Population	Percentage (of total)
White	622	94.53%
Two or more races	20	3.04%
Black or African American	16	2.43%

Onida Marital Status

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Onida's average per capita income is $46,683. Household income levels show a median of $71,050. The poverty rate stands at 6.58%.

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	$119,286	-
Families	$110,625	$125,332
Households	$71,050	$95,527
Non Families	$47,353	$53,714

$46,683

Average Income

$71,050

Median Household Income

6.58%

Poverty Rate