Dewey County Map, South Dakota

Written and Fact-checked by , Reviewed by | Last Updated On: May 11, 2026

Map of Dewey County - Dewey County is a county located in the U.S. state of South Dakota. Dewey County Map showing cities, highways, important places and water bodies. Get Where is Dewey County located in the map, major cities in Dewey county, population, areas, and places of interest.

Map of Dewey County, South Dakota

Map of Dewey County, South Dakota

About Dewey County Map, South Dakota: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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About Dewey County, South Dakota

Dewey County is a county located in the U.S. state of South Dakota. It's county seat is Timber Lake. As per 2020 census, the population of Dewey County is 5246 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 2,303 sq mi (5,965 km2). Dewey County was established on 1873.

Dewey County Facts

ContinentNorth America
CountryUnited States
StateSouth Dakota
County SeatTimber Lake
Largest City/TownEagle Butte
Established1883
Total Area2,445 sq mi (6,332 sq km)
Land Area2,302 sq mi (5,962 sq km)
Water Area143 sq mi (370 sq km)
Population5,239 (Census 2020)
Population Density2.3 people per sq mi
Time ZoneMountain Time Zone (MT)
Major HighwaysUS 212, SD 63, SD 65
Major RiversMissouri River, Cheyenne River
Neighboring CountiesCorson County, Ziebach County, Stanley County, Sully County, Potter County, Walworth County
Famous ForCheyenne River Sioux Reservation, prairie landscapes, Missouri River recreation, Native American heritage
Top AttractionsCheyenne River Reservation cultural sites, Lake Oahe recreation, Eagle Butte attractions, fishing and hunting areas
Official WebsiteOfficial Website

About Dewey County, South Dakota

Dewey County is located in north-central South Dakota in the United States and was established in 1883. The county seat is Timber Lake, while Eagle Butte is the largest community in the county. The county is known for Native American heritage, the Cheyenne River Sioux Reservation, Missouri River recreation, and vast prairie landscapes.

Cities and Towns in Dewey County, South Dakota

City/TownPopulation (Census 2020)Latitude & Longitude
Eagle Butte1,25844.9994°N, 101.2332°W
Timber Lake (county seat)44345.0744°N, 101.0740°W
Isabel13545.3997°N, 101.4292°W
Whitehorse10645.2653°N, 100.9568°W
La Plant17145.1280°N, 100.9709°W
Promise4445.2916°N, 101.6610°W

Golf Courses in Dewey County, South Dakota

Golf CourseLocationLatitude & Longitude
Timber Lake Golf CourseTimber Lake45.0758°N, 101.0784°W
Mobridge Country Club nearbyMobridge45.5358°N, 100.4334°W
Gettysburg Country Club nearbyGettysburg44.9992°N, 99.9511°W
Selby Golf Club nearbySelby45.5055°N, 100.0328°W

Roads and Highways in Dewey County, South Dakota

Major highways connect the county to central South Dakota communities, reservations, and Missouri River recreation areas.

  • US Highway 212 - major east-west highway across northern South Dakota
  • South Dakota Highway 63 - north-south route connecting reservation communities
  • South Dakota Highway 65 - scenic roadway serving prairie and river areas

What are Neighboring Counties of Dewey County

  • Corson County (north)
  • Ziebach County (west)
  • Stanley County (south)
  • Sully County (southeast)
  • Potter County (east)
  • Walworth County (northeast)

What are the Top Attractions in Dewey County, South Dakota

The county offers a mix of Native American culture, prairie scenery, and outdoor recreation.

  • Cheyenne River Sioux Reservation cultural sites - tribal heritage and Native American history
  • Lake Oahe recreation areas - boating, fishing, camping, and water sports
  • Eagle Butte community attractions - local parks, cultural events, and dining
  • Missouri River fishing destinations - walleye, northern pike, and catfish fishing
  • Prairie scenic landscapes - rolling grasslands and Great Plains views
  • Traditional powwows and tribal events - celebrations of Lakota culture and heritage
  • Camping and RV parks near Lake Oahe - outdoor recreation opportunities
  • Birdwatching and wildlife viewing areas - habitat for migratory birds and prairie wildlife
  • Timber Lake recreation facilities - parks and family outdoor activities
  • Cheyenne River cultural centers and historical sites - educational experiences
  • Regional hunting areas - pheasant, deer, and waterfowl hunting destinations
  • Scenic drives along prairie and reservoir landscapes - photography and sightseeing opportunities
  • Community fairs and rodeos - local entertainment and agricultural traditions
  • Lake Oahe shoreline access points - boating ramps and fishing piers

What is the Distance from Dewey County to Nearby Cities

The following distances are measured by road (driving).

  • Eagle Butte to Mobridge (Walworth County), South Dakota - 64 mi (103 km)
  • Eagle Butte to Pierre (Hughes County), South Dakota - 77 mi (124 km)
  • Eagle Butte to Aberdeen (Brown County), South Dakota - 168 mi (270 km)
  • Eagle Butte to Rapid City (Pennington County), South Dakota - 169 mi (272 km)
  • Eagle Butte to Bismarck (Burleigh County), North Dakota - 186 mi (299 km)
  • Eagle Butte to Fargo (Cass County), North Dakota - 341 mi (549 km)
  • Eagle Butte to Sioux Falls (Minnehaha County), South Dakota - 290 mi (467 km)
  • Eagle Butte to Billings (Yellowstone County), Montana - 371 mi (597 km)
  • Eagle Butte to Minneapolis (Hennepin County), Minnesota - 470 mi (756 km)
  • Eagle Butte to Omaha (Douglas County), Nebraska - 433 mi (697 km)
  • Eagle Butte to Denver (Denver County), Colorado - 566 mi (911 km)
  • Eagle Butte to Casper (Natrona County), Wyoming - 317 mi (510 km)

FAQs about Dewey County

Where is Dewey County located?

Dewey County is located in north-central South Dakota along the Missouri River and Lake Oahe region.

What is the population of Dewey County?

Dewey County had a population of 5,239 according to the 2020 United States Census.

What is Dewey County known for?

Dewey County is known for the Cheyenne River Sioux Reservation, prairie landscapes, fishing, and Missouri River recreation.

What are the major highways in Dewey County?

The major highways include US Highway 212, South Dakota Highway 63, and South Dakota Highway 65.

Are there golf courses in Dewey County?

Yes, Dewey County has golf facilities including Timber Lake Golf Course and nearby regional golf clubs.

References

  1. QuickFacts - U.S. Census Bureau
  2. United States Census Bureau
  3. United States Geological Survey (USGS)
  4. National Geodetic Survey
  5. Official Website