Township · South Dakota
Kosciusko Township, South Dakota
Kosciusko Township, township, in Day County, South Dakota. Kosciusko Township had 185 residents on July 1, 2025 by the Census Bureau's estimate, up 3.4% from the Bureau's April 2020 estimates base of 179; the 2020 Census counted 203 on the place as it was defined then and the ACS 2020-2024 5-year estimates put it at 229 (±84). GEOID 4603734300.
Residents, July 2025 estimate
185
Census Bureau estimate (no margin published)
2020 Census count: 203 · ACS 2020-2024: 229 ±84
Median household income
$105,139
±$21,529 (90% margin)
South Dakota: $75,081
Median home value
$651,000
±$199,010 (90% margin)
South Dakota: $257,400
Median gross rent
not published
South Dakota: $946
Where is Kosciusko Township and what county is it in?
Kosciusko Township is a township in Day County, South Dakota. It covers 39.6 square miles of land, 5 residents per square mile in 2020.
Source: 2024 Gazetteer and 2020 place-by-county files, U.S. Census Bureau · Census reference files
How many people live in Kosciusko Township, and is it growing?
The Census Bureau estimates that 185 people lived in Kosciusko Township on July 1, 2025, up 3.4% since 2020, slower than South Dakota (+5.5%). The Census Bureau's yearly estimates start from its own April 2020 base for Kosciusko Township, 179, which differs from the 2020 Census count of 203: the estimates follow the place as the estimates program defines it today (its present boundaries, and for a consolidated city-county the area the program assigns it), so the change since 2020 is measured from that base. The 2020-2024 American Community Survey, a five-year sample, puts the population at 229 (±84).
| Measure | Kosciusko Township | Day County | Change since 2015-2019 |
|---|---|---|---|
| Total population | 229±84 | 5,437 | no clear change |
| Households | 121±41 | 2,371 | no clear change |
| Average household size | 1.89±0.32 | 2.24 | no clear change |
| Housing units | 394±52 | 3,440 | no clear change |
Kosciusko Township's population since 2000
From 174 in 2000 to 185 in 2025: up 6.3%. The 2000, 2010 and 2020 figures are census counts, each for Kosciusko Township as it was drawn that year: a place that annexed land, or a community that has since incorporated, covered a different area then. The 2005 figure is the Census Bureau's intercensal estimate, revised to fit the 2000 and 2010 counts and drawn on 2010 boundaries; 2015 and 2025 are July 1 estimates made from the census before them.
Source: The 2000, 2010 and 2020 Census counts and the Census Bureau's population estimates (intercensal 2000-2010, Vintage 2020, Vintage 2025) · Census population estimates
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census PEP Vintage 2025 (SUB-EST2025, CO-EST2025); 2020 Census P.L. 94-171 · Check it at data.census.gov
Who lives in Kosciusko Township?
The median resident of Kosciusko Township is 63.6 years old. The largest group is non-Hispanic white residents at 95.6%, then non-Hispanic residents of two or more races at 4.4%.
| Measure | Kosciusko Township | Day County | Change since 2015-2019 |
|---|---|---|---|
| Median age | 63.6±6.0 | 44.8 | no clear change |
| Under 18 years | 8.3%±12.1 pts | 22.4% | – |
| 65 years and over | 47.6%±18.8 pts | 26.7% | – |
| Male | 53.3%±6.1 pts | 49.9% | – |
| Hispanic or Latino (any race) | 0.0%±10.3 pts | 2.8% | – |
| White alone, not Hispanic | 95.6%±6.4 pts | 83.0% | no clear change |
| Black or African American alone, not Hispanic | 0.0%±10.3 pts | 0.0% | – |
| Asian alone, not Hispanic | 0.0%±10.3 pts | 0.1% | – |
| American Indian and Alaska Native alone, not Hispanic | 0.0%±10.3 pts | 9.8% | – |
| Native Hawaiian and Other Pacific Islander alone, not Hispanic | 0.0%±10.3 pts | 0.0% | – |
| Two or more races, not Hispanic | 4.4%±6.4 pts | 4.2% | – |
| Some other race alone, not Hispanic | 0.0%±10.3 pts | 0.1% | – |
| Born outside the United States | 0.0%±10.3 pts | 1.7% | – |
| Speak a language other than English at home (age 5+) | 0.0%±10.3 pts | 3.9% | – |
| Civilian veterans (age 18+) | 14.8%±9.0 pts | 8.6% | – |
| With a disability | 25.3%±13.7 pts | 13.2% | – |
| No health insurance coverage | 6.6%±8.9 pts | 8.5% | – |
| High school graduate or higher (age 25+) | 93.9%±5.8 pts | 93.4% | – |
| Bachelor's degree or higher (age 25+) | 53.0%±14.9 pts | 22.0% | +22.2 pts |
| Graduate or professional degree (age 25+) | 18.2%±9.1 pts | 6.1% | – |
| Lived in the same house a year earlier | 85.2%±12.2 pts | 86.2% | – |
| Moved from another state in the past year | 0.0%±10.3 pts | 3.4% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profiles DP02, DP05) · Check it at data.census.gov
What do households in Kosciusko Township earn?
Half of Kosciusko Township's 121 households earn less than $105,139 a year (±$21,529), against $66,033 in Day County and $75,081 in South Dakota. In 2015-2019 the median was $60,638 in 2024 dollars, so it rose by $44,501 after inflation.
| Measure | Kosciusko Township | Day County | Change since 2015-2019 |
|---|---|---|---|
| Median household income | $105,139±$21,529 | $66,033 | +$44,501 |
| Mean household income | $114,793±$23,491 | $91,552 | – |
| Per capita income | $60,241±$10,123 | $39,593 | no clear change |
| People below the poverty line | 3.9%±4.6 pts | 14.8% | – |
| Children under 18 below the poverty line | 0.0%±59.7 pts | 24.5% | – |
| Households receiving SNAP | 0.0%±18.6 pts | 7.1% | – |
| Households with a computer | 82.6%±14.4 pts | 87.3% | – |
| Households with a broadband subscription | 75.2%±16.1 pts | 83.8% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What does housing cost in Kosciusko Township?
Owners occupy 90.1% of Kosciusko Township's occupied homes and renters 9.9%. The median owner-occupied home is valued at $651,000 by its owner (±$199,010).
| Measure | Kosciusko Township | Day County | Change since 2015-2019 |
|---|---|---|---|
| Median home value (owner-occupied) | $651,000±$199,010 | $173,600 | – |
| Median monthly owner costs, with a mortgage | $2,725±$242 | $1,247 | – |
| Owner-occupied homes | 90.1%±10.2 pts | 74.6% | no clear change |
| Renter-occupied homes | 9.9%±10.2 pts | 25.4% | – |
| Housing units | 394±52 | 3,440 | no clear change |
| Homeowner vacancy rate | 0.0%±20.3 pts | 0.3% | – |
| Rental vacancy rate | 0.0%±75.1 pts | 2.6% | – |
| Single-family detached homes | 95.7%±3.9 pts | 85.1% | – |
| Mobile homes | 4.3%±3.9 pts | 4.3% | – |
| Built 2020 or later | 3.0%±3.0 pts | 0.7% | – |
| Built 2010 to 2019 | 19.5%±7.4 pts | 9.2% | – |
| Built 1939 or earlier | 14.2%±6.6 pts | 27.7% | – |
| Households with no vehicle | 4.1%±6.4 pts | 6.0% | – |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP04) · Check it at data.census.gov
How do people in Kosciusko Township work and get to work?
74.7% of Kosciusko Township's workers drive alone. The average trip to work takes 43.5 minutes.
| Measure | Kosciusko Township | Day County | Change since 2015-2019 |
|---|---|---|---|
| In the labor force (age 16+) | 50.7%±16.7 pts | 57.5% | – |
| Unemployment rate | 0.0%±20.0 pts | 2.1% | – |
| Drove alone to work | 74.7%±27.0 pts | 76.3% | – |
| Carpooled | 0.0%±22.1 pts | 7.4% | – |
| Public transportation | 0.0%±22.1 pts | 0.7% | – |
| Walked | 0.0%±22.1 pts | 3.2% | – |
| Worked from home | 25.3%±27.0 pts | 12.0% | – |
| Mean travel time to work | 43.5 min±16.5 | 22.3 min | +21.7 min |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) (Data Profile DP03) · Check it at data.census.gov
What census tracts are in Kosciusko Township?
No census tract lies mostly in Kosciusko Township; 1 tract reaches into it (2020 census blocks).
| Tract | Residents, 2020-2024 | Median household income |
|---|---|---|
| Tract 9529Day County | 1,872 | $65,750 |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); 2020 block assignment files (tract share = share of the tract's census blocks in Kosciusko Township) · Census block assignment files
How does Kosciusko Township compare with other places in South Dakota?
By the Census Bureau's July 2025 estimates, Kosciusko Township is the 12,601st-most populous of the 16,079 U.S. towns and townships that have one and the 217th-most populous of 895 in South Dakota.
Kosciusko Township is not ranked by income or the other survey measures: those rankings include places of 1,000 or more residents (2020 Census) with a reliable estimate.
| Measure | Rank | Of |
|---|---|---|
| Population, July 2025 estimate | 217th | 895 |
Kosciusko Township's figures with every place in South Dakota (CSV)
Every place in South Dakota, sortable · Compare Kosciusko Township with other places
Source: PlainCities ranks computed from the American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) and PEP Vintage 2025 · How ranks are computed
How reliable are the figures for Kosciusko Township?
26 of the 55 figures for Kosciusko Township on this page carry a coefficient of variation over 40% and are marked with a ring: they come from a small sample, so read them as rough.
The American Community Survey samples about one household in eight over five years, so every figure is an estimate with a 90% margin of error (shown under each value). A ring marks an estimate whose coefficient of variation is over 40%. A change is called only when the gap between the two periods is larger than their combined 90% margin (the square root of the sum of the two squared margins), the Census Bureau's test. How to read a margin of error.
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026): margins of error as published · ACS technical documentation
How these figures are made: methodology and release checks · reading a margin of error · every state · corrections
Not on this page: crime, weather and schools for Kosciusko Township are other agencies' records. Crime: the FBI's Crime Data Explorer · climate: NOAA's U.S. Climate Normals · schools: the National Center for Education Statistics' school search.