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Where am ILOCATED

Lyman County, South Dakota

Lyman County, South Dakota, has 3,694 residents (July 2025 estimate). Its county seat is Kennebec. It uses Central Time and covers 1,642 sq mi (4,253 km²) of land.

Sioux FallsRapid CityAberdeen
Lyman County in South Dakota
Brule CountyBuffalo CountyJones CountyLower BruleOacomaWest BrulePreshoKennebec
Lyman County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
3,694
Land area
1,642 sq mi (4,253 km²)
County seat or government
Kennebec
Time zone
Central TimeUTC-06:00 in January; UTC-05:00 in July
Median household income
$67,143 ± $7,804
Median home value
$165,800 ± $10,861
Median rent, with utilities
$651 ± $54
Homes lived in by their owners
69.9% ± 5.1 points
County type
County
Metro or micro area
Outside any metro or micro areaNext to: Pierre, SD micro area
Water area
64.6 sq mi (167 km²)
State
South Dakota
County code (FIPS)
46085
Coordinates (central point)
43.894812, -99.841925
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 Lyman 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. 575322,929 people
  2. 575331,674 people
  3. 575481,442 people
  4. 57365599 people
  5. 57568540 people
  6. 57569497 people
  7. 57544421 people
  8. 57576205 people
  9. 57534130 people

9 ZIP Code areas overlap Lyman 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 Lyman County, largest first

  1. Vivian Township158 people
  2. Oacoma Township51 people
  3. Bailey Township26 people
  4. Rex Township16 people
  5. Iona Township11 people
  6. Pratt Township0 people

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

School districts in Lyman County, largest first

  1. Chamberlain School District 07-16,337 people
  2. Winner School District 59-24,628 people
  3. Lyman School District 42-12,944 people
  4. Gregory School District 26-41,843 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.

Tribal areas in Lyman County, largest first

  1. Lower Brule Reservation and Off-Reservation Trust Land1,521 people

American Indian, Alaska Native and Native Hawaiian areas as the Census Bureau maps them, with at least 2% of their area here, water included. These lines don’t decide membership, jurisdiction or land status.

Cities, towns and communities, largest first

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

  1. Lower Brule, South Dakota (CDP)743 people
  2. Oacoma, South Dakota (town)548 people
  3. West Brule, South Dakota (CDP)471 people
  4. Presho, South Dakota (city)313 people
  5. Kennebec, South Dakota (town)296 people
  6. Reliance, South Dakota (town)211 people
  7. Vivian, South Dakota (CDP)50 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Buffalo County, South Dakota33 mi east
  2. Hughes County, South Dakota34 mi north
  3. Tripp County, South Dakota38 mi south
  4. Brule County, South Dakota39 mi east
  5. Jones County, South Dakota42 mi west
  6. Hyde County, South Dakota48 mi north
  7. Mellette County, South Dakota50 mi southwest
  8. Stanley County, South Dakota57 mi northwest
  9. Gregory County, South Dakota59 mi southeast
  10. Charles Mix County, South Dakota78 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.