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, Native American, Asian, Native Hawaiian or Pacific Islander, other race and multiracial populations.

Population by Race

White

Two or more races

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Other race

Race	Population	Percentage (of total)
White	622	94.53%
Two or more races	20	3.04%
Black or African American	16	2.43%
Native American	0	0%
Asian	0	0%
Native Hawaiian or Pacific Islander	0	0%
Other race	0	0%

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