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South Dakota›Buffalo County
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Gann ValleySD

Home to 6 people, the town was settled in 1885.

Population
6
Census survey, 2020–24

Is Gann Valley a good place to live?

100% of households own their home in Gann Valley, above both South Dakota’s towns (68%) and U.S. towns (73%). Gann Valley has fewer than 1,000 residents, too few for fair grades; the figures below are still real.

Small town

6 people, and everyone knows the way

In a town this size, neighbors are the best guide. Ask them anything.

Nearby towns
Elvira Township · 2 miCrow Township · 7 miLogan Township · 8 miLyon Township · 9 miMarlar Township · 9 miUnion Township · 11 mi
Getting set up

Moving to Gann Valley: who provides what

Gann Valley is unincorporated, so Buffalo County and regional agencies provide most services.

PowerCentral Electric Coop14.7¢/kWh · EIA 2025HIFLD · EIA
WaterAurora-Brule Rural Water SystemNo health-based violations in 5 years · EPAEPA
Internet1 providers100% of addresses get 100/20 MbpsFCC
Trash & county servicesBuffalo CountyBuffalo County provides services here
SchoolsWessington Springs School District 36-2Which school depends on your addressNCES
Register to voteIn personSouth Dakota has no online registration; you can register in person until 15 days before Election Day or by mail (received 15 days before).vote.gov
Who runs elections hereBuffalo County AuditorBuffalo County; contacts on the Handbook page.FVAP, Jul 2023
ZIP code5734157341 100%Census 2020

EPA SDWIS (Oct 9, 2026) · HIFLD + EIA-861 2025 · Census 2020 ZCTAs · NCES 2024–25 · registration: vote.gov, updated Aug 3, 2026.

The data

Ordered by what stands out in Gann Valley.

Natural hazards

Gann Valley has a high natural-hazard risk, chiefly from cold waves

The natural-hazard score from FEMA in Gann Valley is 74 of 100. FEMA puts 55% of the town’s expected hazard losses down to cold waves, and 25% to inland flooding.

74risk score of 100
FEMA risk score
74High riskLowerHigher
Cold wavesInland floodingWildfire
Full pageGann Valley’s hazards pageOpen the full Hazards page
What it facesHigh riskFlood claims0 paid flood claims · No paid flood claims on recordPast disasters18 disaster declarations · Declared for the countyGet ready7.2 events a year, on average · Ready for cold waves

FEMA National Risk Index · OpenFEMA

Climate

Expect snowy winters and pleasant summers in Gann Valley

A winter brings about 41 inches of snow, with January nights at 8° and July afternoons at 86°.

41″snow a winter

Typical low → high °F

Winter10–31°
Spring33–57°
Summer58–83°
Fall36–60°
Oct 1
typical first frost
May 6
typical last frost
+1.3°
vs. the 20th-century average
Full pageGann Valley’s climate pageOpen the full Climate page
A year of weatherJuly highs 86°, January lows 8°Rain & snow41″ of snow a winter · 23 inches of rain and snow a yearHeating & coolingMostly a heating billThen and now+1.3° vs. the 20th century · Warmer than the 20th-century average

NOAA U.S. Climate Normals, 1991–2020

Health

More of Gann Valley’s adults smoke cigarettes than in the typical South Dakota or U.S. town

Only one of the 36 South Dakota towns we compare has a higher share of adults who have high blood pressure than Gann Valley. For adults here, the share who get no exercise outside work is 35%. The town does better than the South Dakota average on 2 of 26 CDC measures and worse on 16.

Gann ValleySouth Dakota townsU.S. towns
Smoke cigarettes (CDC PLACES)23%14%14%
Diabetes (CDC PLACES)17%10%12%
Get no exercise (CDC PLACES)35%22%25%
Fair or poor health (CDC PLACES)27%16%19%
26 measures vs. South Dakota
2 better8 too close to call16 worse
What stands outGann ValleySD
Fewer binge drinkers15.6%18.8%
More adults treating high blood pressure80%75.9%
More older adults who have lost all their teeth27.9%12.7%
Avera Weskota Memorial Medical Center - Cah
21.3 mi away · emergency room
3 of 3
care shortages: primary care, dental, mental health
Full pageGann Valley’s health reportOpen the full Health report
Everyday habitsMore smokersHospitals & doctors nearby21.3 miles to an ER · Avera Weskota Memorial Medical Center - CahHow adults are doingMore adults in fair or poor healthEvery CDC estimateBetter than SD on 2 of 26

CDC PLACES 2025 · modeled estimates for adults · CMS · HRSA

Keep exploring

Everything we know about Gann Valley

12pages on Gann Valley
The big questions
HealthBetter than SD on 2 of 26 CDC measuresNatural hazardsFEMA risk higher than 74% of U.S. communities · cold waves
Out and about
PlacesLibraryKimball Public LibraryColleges
The story
HistorySettled 1885Climate86° summer highs · 41″ of snow
Day to day
NewsWeatherHandbookZIP code 57341Town SquareNeighbors
After high school

Colleges nearby

None within 15 miles of Gann Valley; the nearest are

Dakota Wesleyan UniversityUniversity or college · Private nonprofit · Mitchell53 mi$33,790 tuitionMitchell Technical CollegeCommunity college · Public · Mitchell54.6 mi$7,524 in-state tuitionDakota State UniversityUniversity or college · Public · Madison93.2 mi$9,654 in-state tuition

About 0 of every 100 Gann Valley residents are enrolled in college, against 5 across South Dakota.

Prices by family income, graduation and earnings →

About Gann Valley

Unincorporated community in South Dakota, United States

Official town website ↗

Gann Valley is a census-designated place in and the county seat of Buffalo County, South Dakota, United States. The town had a population of 10 as of the 2020 census. It is the smallest unincorporated county seat in the United States.

From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Established
1885
Elevation
1,604 ft
ZIP code
57341
Area code
605

Questions about Gann Valley

Short answers, built from the data on this page.

Is Gann Valley, SD a good place to live?

Gann Valley has fewer than 1,000 residents, too few for fair grades; the figures below are still real.