Jefferson Flag

Jefferson

County:
Union County
County Seat:
No
Area (mi²):
0.51
State:
South Dakota

Jefferson is a city located in Union County, South Dakota. Jefferson has a 2026 population of 437. Jefferson is currently declining at a rate of -1.35% annually and its population has decreased by -7.61% since the most recent census, which recorded a population of 473 in 2020.

The median household income in Jefferson is $82,888 with a poverty rate of 4.87%. The median age in Jefferson is 40.6 years: 35 years for males, and 47.3 years for females. For every 100 females there are 113.9 males.

437
Total Population
856
Density (mi²)
-6 -1.35%
Growth

Jefferson Population

Jefferson Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
2026437-6-1.35%
2025443-6-1.34%
2024449-1-0.22%
2023450-8-1.75%
2022458-6-1.29%
2021464-9-1.9%
2020473-1-0.21%
201951520.39%
201851300%
2017513-6-1.16%
2016519-4-0.76%
2015523-16-2.97%
2014539-3-0.55%
2013542-9-1.63%
201255110.18%
201155030.55%
201055120.36%

Median Age

Overall: 40.6 years
Female: 47.3 years
Male: 35 years

Jefferson Adults

There are 429 adults, (103 of whom are seniors) in Jefferson.

Sex Ratio

Female: 259 (46.8%)
Male: 295 (53.2%)

Demographics

The racial composition of Jefferson includes 87.91% White, 6.14% Native American, and smaller percentages for other race and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White48787.91%
Native American346.14%
Two or more races274.87%
Other race61.08%
Race
Population ↓
Percentage (of total)
Native American346.14%
Other race61.08%
Two or more races20.36%
Race
Population ↓
Percentage (of total)
White48787.91%
Two or more races254.51%

Jefferson Marital Status

Economics and Income Statistics

Jefferson 's average per capita income is $40,139. Household income levels show a median of $82,888. The poverty rate stands at 4.87%.

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$84,914-
Families$83,836$86,095
Households$82,888$78,422
Non Families$49,375$62,411

$40,139

Average Income

$82,888

Median Household Income

4.87%

Poverty Rate

Nearby Cities

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)