Onida Flag

Onida

County:
Sully County
County Seat:
Yes
Area (mi²):
0.672
State:
South Dakota

Onida is a city located in Sully County, South Dakota. Onida has a 2026 population of 635. It is also the county seat of Sully County. Onida is currently declining at a rate of -0.78% annually and its population has decreased by -4.51% since the most recent census, which recorded a population of 665 in 2020.

The median household income in Onida is $70,000 with a poverty rate of 4.85%. The median age in Onida is 42.2 years: 49.3 years for males, and 38.4 years for females. For every 100 females there are 104.4 males.

635
Total Population
945
Density (mi²)
-5 -0.78%
Growth

Onida Population

Onida Population

Year ↓
Population
Growth
Annual Change
2026635-5-0.78%
2025640-7-1.08%
2024647-9-1.37%
2023656-1-0.15%
2022657-12-1.79%
202166940.6%
202066510.15%
2019624-7-1.11%
2018631-13-2.02%
2017644-9-1.38%
201665320.31%
2015651-9-1.36%
2014660-19-2.8%
2013679-3-0.44%
2012682233.49%
201165910.15%
201066350.76%

Median Age

Overall: 42.2 years
Female: 38.4 years
Male: 49.3 years

Onida Adults

There are 469 adults, (144 of whom are seniors) in Onida.

Sex Ratio

Female: 315 (48.9%)
Male: 329 (51.1%)

Demographics

The racial composition of Onida includes 94.1% White, and smaller percentages for Black or African American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White60694.1%
Two or more races274.19%
Black or African American111.71%
Race
Population ↓
Percentage (of total)
White60694.1%
Two or more races274.19%
Black or African American111.71%

Onida Marital Status

Economics and Income Statistics

Onida's average per capita income is $49,271. Household income levels show a median of $70,000. The poverty rate stands at 4.85%.

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$104,583-
Families$102,708$123,836
Households$70,000$96,424
Non Families$49,931$67,754

$49,271

Average Income

$70,000

Median Household Income

4.85%

Poverty Rate

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)