SDMap-doton-Grenville, 2004
Grenville’s story
125 years in pictures
Census counts: 247 in 1930, 48 in 2020. The archive holds 1 old photo or paper going back to 2004 and 2 maps from 1970 on.
- 1901Grenville is settled
GrenvilleSD
A town of 48, settled in 1901.
Population
48
2025 Census estimate · +2.1% since 2020
Median home value
$41K
Census ACS
Household income
$90K
median
Median age
57.8
years
Land area
0 sq mi
Is Grenville a good place to live?
Grenville’s median age is 57.8 years, above both South Dakota’s towns (39.5 years) and U.S. towns (40.5 years). No town among the 36 in South Dakota we compare has a lower share of adults with a bachelor’s degree than Grenville. Grenville has fewer than 1,000 residents, too few for fair grades; the figures below are still real.
Small town
48 people, and everyone knows the way
In a town this size, neighbors are the best guide. Ask them anything.
Nearby towns
Getting set up
The full setup list →Moving to Grenville: who provides what
Who provides power, water and the rest in Grenville, and how to reach them.
PowerNorthWestern Energy13.3¢/kWh · EIA 2025HIFLD · EIA
WaterGrenville water systemNo health-based violations in 5 years · EPAEPA
Internet2 providers100% of addresses get 100/20 MbpsFCC
Trash & dumpNot on file yetWe don’t have Grenville’s trash rules yet
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.govWho runs elections hereDay County AuditorDay County; contacts on the Handbook page.FVAP, Jul 2023
ZIP codes57239, 5727457239 96% · 57274 4%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 Grenville.
Climate
Compared with most of South Dakota and the rest of the country, a typical July afternoon in Grenville is cooler
At 80°F, Grenville’s July high is against 85°F in South Dakota’s towns and 85°F across U.S. towns. Grenville has cold, snowy winters and pleasant summers.
36″snow a winter
Typical low → high °F
Winter5–23°
Spring31–52°
Summer57–78°
Fall34–55°
Oct 12
typical first frost
May 1
typical last frost
+1.0°
vs. the 20th-century average
NOAA U.S. Climate Normals, 1991–2020
Health
Grenville stands out in South Dakota and nationally, with more of its adults who have diabetes
17% of adults have diabetes in Grenville. Only 1 of the 36 South Dakota towns we compare have a higher share of adults who have high blood pressure than Grenville. 19% of adults have been diagnosed with depression in Grenville.
| Grenville | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Diabetes (CDC PLACES) | 17% | 10% | 12% |
| High blood pressure (CDC PLACES) | 44% | 31% | 35% |
| Binge drink (CDC PLACES) | 14% | 19% | 16% |
| Frequent physical distress (CDC PLACES) | 16% | 12% | 14% |
26 measures vs. South Dakota
4 better12 too close to call10 worse
| What stands out | Grenville | SD |
|---|---|---|
| Fewer binge drinkers | 13.7% | 18.8% |
| More adults treating high blood pressure | 83.5% | 75.9% |
| More adults with heart disease | 11.4% | 6.8% |
Sanford Hospital Webster - Cah
10.9 mi away · emergency room
3 of 3
care shortages: primary care, dental, mental health
CDC PLACES 2025 · modeled estimates for adults · CMS · HRSA
Natural hazards
Moderate risk in Grenville, with inland flooding at the top
Expected storm and flood damage is lower than in 59% of U.S. communities. Since 1996, 7 flood insurance claims have been paid out in Grenville.
41risk score of 100
FEMA risk score
Inland floodingCold wavesStrong wind
7
paid flood claims since 1996
1
federal disasters paid out here
FEMA flood insurance claims · FEMA National Risk Index · OpenFEMA
Keep exploring
Everything we know about Grenville
16pages on Grenville
The big questions
Out and about
After high school
Colleges nearby
None within 15 miles of Grenville; the nearest are
Sisseton Wahpeton CollegeUniversity or college · Public · Sisseton17.3 mi$4,330 in-state tuitionLake Area Technical CollegeCommunity college · Public · Watertown41.6 mi$6,718 in-state tuition
About 0 of every 100 Grenville residents are enrolled in college, against 5 across South Dakota.
About Grenville
Town in South Dakota, United States
Grenville is a town in Day County, South Dakota, United States. The population was 48 at the 2020 census. Grenville was laid out in 1914, and named for the greenery of the original town site.
From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)
- Area
- 0.2 sq mi
- Elevation
- 1,864 ft
- ZIP code
- 57239
- Area code
- 605
Questions about Grenville
Short answers, built from the data on this page.
Is Grenville, SD a good place to live?
Grenville has fewer than 1,000 residents, too few for fair grades; the figures below are still real.