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 2025 population of 431. Jefferson is currently declining at a rate of -1.82% annually and its population has decreased by -8.88% since the most recent census, which recorded a population of 473 in 2020.

The average household income in Jefferson is $78,129 with a poverty rate of 3.21%. The median age in Jefferson is 34 years: 33.6 years for males, and 38.5 years for females.

431
Total Population
844
Density (mi²)
-8 -1.82%
Growth

Jefferson Population

Jefferson Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Jefferson includes 90.24% White, 4.18% Native American, and smaller percentages for other race and multiracial populations.

Population by Race

White (90.2%)

Native American (4.2%)

Two or more races (3.2%)

Other race (2.4%)

Race
Population
Percentage (of total)
White64790.24%
Native American304.18%
Two or more races233.21%
Other race172.37%

Jefferson Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Jefferson's average per capita income is $41,250. Household income levels show a median of $81,149. The poverty rate stands at 3.21%.

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$85,750-
Families$81,554$84,363
Households$81,149$78,129
Non Families$50,000$62,464

$41,250

Average Income

$81,149

Median Household Income

3.21%

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)