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Where am ILOCATED

Lake County, South Dakota

Lake County, South Dakota, has 10,993 residents (July 2025 estimate). Its county seat is Madison. It uses Central Time and covers 563 sq mi (1,458 km²) of land.

Sioux FallsRapid CityAberdeen
Lake County in South Dakota
MadisonLake MadisonRamonaBrant Lake South
Lake County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
10,993
Land area
563 sq mi (1,458 km²)
County seat or government
Madison
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$76,808 ± $7,301
Median home value
$247,600 ± $21,400
Median rent, with utilities
$947 ± $88
Homes lived in by their owners
73.8% ± 3.3 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Brookings, SD micro area and Sioux Falls, SD-MN metro area
Water area
12.3 sq mi (31.7 km²)
State
South Dakota
County code (FIPS)
46079
Coordinates (central point)
44.028450, -97.123223
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in Lake County

Time zoneLocal time and UTC offsetNext clock change
Central TimeAmerica/ChicagoUTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 570427,756 people
  2. 570225,339 people
  3. 570713,149 people
  4. 570581,881 people
  5. 572121,819 people
  6. 570171,628 people
  7. 570181,495 people
  8. 570751,296 people
  9. 57054703 people
  10. 57016676 people
  11. 57076325 people
  12. 57057196 people
All 14
  1. 57050176 people
  2. 57051163 people

14 ZIP Code areas overlap Lake County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Townships in Lake County, largest first

  1. Herman Township844 people
  2. Lake View Township676 people
  3. Chester Township641 people
  4. Wentworth Township589 people
  5. Rutland Township276 people
  6. Franklin Township216 people
  7. Summit Township159 people
  8. Winfred Township158 people
  9. Le Roy Township152 people
  10. Farmington Township130 people
  11. Badus Township81 people
  12. Nunda Township62 people
All 16
  1. Concord Township56 people
  2. Wayne Township30 people
  3. Orland Township24 people
  4. Clarno Township5 people

People counts are American Community Survey 2020–2024 5-year estimates. All townships in South Dakota, by county

School districts in Lake County, largest first

  1. Madison Central School District 39-28,249 people
  2. Sioux Valley School District 05-53,851 people
  3. McCook Central School District 43-72,188 people
  4. Colman-Egan School District 50-52,108 people
  5. Chester School District 39-11,721 people
  6. Oldham-Ramona-Rutland 39-61,510 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Madison, South Dakota (city)6,094 people
  2. Lake Madison, South Dakota (CDP)936 people
  3. Ramona, South Dakota (town)538 people
  4. Brant Lake South, South Dakota (CDP)211 people
  5. Chester, South Dakota (CDP)152 people
  6. Wentworth, South Dakota (village)138 people
  7. Brant Lake, South Dakota (city)63 people
  8. Nunda, South Dakota (town)40 people
  9. Winfred, South Dakota (CDP)34 people
  10. Rustic Acres Colony, South Dakota (CDP)30 people
  11. Graceville Colony, South Dakota (CDP)0 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Moody County, South Dakota22 mi east
  2. Miner County, South Dakota24 mi west
  3. McCook County, South Dakota27 mi southwest
  4. Brookings County, South Dakota29 mi northeast
  5. Kingsbury County, South Dakota30 mi northwest
  6. Minnehaha County, South Dakota30 mi southeast

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.