Buffalo County, South Dakota
Buffalo County, South Dakota, has 1,802 residents (July 2025 estimate). Its county seat is Gann Valley. It uses Central Time and covers 471 sq mi (1,221 km²) of land.
- Resident population, July 2025
- 1,802
- Land area
- 471 sq mi (1,221 km²)
- County seat or government
- Gann Valley
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $47,045 ± $11,995
- Median home value
- $117,800 ± $38,765
- Median rent, with utilities
- $540 ± $187
- Homes lived in by their owners
- 52.6% ± 10.0 points
- County type
- County
- Metro or micro area
- Outside any metro or micro area
- Water area
- 16.4 sq mi (42.4 km²)
- State
- South Dakota
- County code (FIPS)
- 46017
- Coordinates (central point)
- 44.044306, -99.203998
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 Buffalo County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-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
6 ZIP Code areas overlap Buffalo 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 Buffalo County, largest first
- Elvira Township6 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in South Dakota, by county
School districts in Buffalo County, largest first
- Chamberlain School District 07-16,337 people
- Miller Area School District 29-42,851 people
- Wessington Springs School District 36-21,496 people
- Kimball School District 07-21,258 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 Buffalo County, largest first
- Crow Creek Reservation1,752 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.
- Fort Thompson, South Dakota (CDP)1,147 people
- Gann Valley, South Dakota (CDP)6 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Brule County, South Dakota22 mi south
- Jerauld County, South Dakota29 mi east
- Lyman County, South Dakota33 mi west
- Hand County, South Dakota36 mi north
- Hyde County, South Dakota37 mi north
Before using this answer on a form
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