Watertown Flag

Watertown

County Seat:
Yes
Area (mi²):
18.439
State:
South Dakota

Watertown is a city located in Codington County, South Dakota. Watertown has a 2026 population of 23,896. It is also the county seat of Codington County. Watertown is currently growing at a rate of 0.85% annually and its population has increased by 5.35% since the most recent census, which recorded a population of 22,683 in 2020.

The median household income in Watertown is $69,600 with a poverty rate of 9.03%. The median age in Watertown is 39.5 years: 38.6 years for males, and 40.7 years for females. For every 100 females there are 106.3 males.

23.9K
Total Population
1,296
Density (mi²)
202 0.85%
Growth

Watertown Population

Watertown Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202623,8962020.85%
202523,6942020.86%
202423,4922831.22%
202323,2091640.71%
202223,0452441.07%
202122,8011410.62%
202022,6834431.99%
201922,240100.04%
201822,230-90-0.4%
201722,3201450.65%
201622,1751190.54%
201522,056-25-0.11%
201422,081760.35%
201322,0051670.76%
201221,8381630.75%
201121,6751550.72%
201021,520380.18%
200020,2372,64515.04%
199017,5921,94312.42%
198015,6492,26116.89%
197013,388-689-4.89%
196014,0771,37810.85%
195012,6992,08219.61%
194010,6174033.95%
193010,2148148.66%
19209,4002,39034.09%
19107,0103,658109.13%
19003,35268025.45%
18902,67200%

Median Age

Overall: 39.5 years
Female: 40.7 years
Male: 38.6 years

Watertown Adults

There are 18,005 adults, (4,553 of whom are seniors) in Watertown.

Sex Ratio

Female: 11,170 (48.5%)
Male: 11,874 (51.5%)

Demographics

The racial composition of Watertown includes 90.08% White, and smaller percentages for Native American, Black or African American, other race, Asian and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White20,75890.08%
Two or more races1,1134.83%
Native American5322.31%
Black or African American2951.28%
Other race1920.83%
Asian1540.67%
Race
Population ↓
Percentage (of total)
Two or more races4461.94%
Black or African American1050.46%
Other race850.37%
White370.16%
Native American20.01%
Race
Population ↓
Percentage (of total)
White20,72189.92%
Two or more races6672.89%
Native American5302.3%
Black or African American1900.82%
Asian1540.67%
Other race1070.46%

Watertown Marital Status

Economics and Income Statistics

Watertown 's average per capita income is $47,319. Household income levels show a median of $69,600. The poverty rate stands at 9.03%.

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$98,338-
Families$91,052$108,110
Households$69,600$87,533
Non Families$45,977$58,864

$47,319

Average Income

$69,600

Median Household Income

9.03%

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)