Lake Sinai TownshipSD
A town of 183.
Is Lake Sinai Township a good place to live?
Lake Sinai Township’s median age is 72.8 years, above both the South Dakota town median (39.5 years) and the median of U.S. towns (40.5 years). No town among the 36 in South Dakota we compare has a higher share of households owning their home than Lake Sinai Township. 18% of the land in Lake Sinai Township is conserved, where South Dakota’s towns sit at 3.3% and U.S. towns at 4.3%. Lake Sinai Township has fewer than 1,000 residents, too few for fair grades; the figures below are still real.
183 people, and everyone knows the way
In a town this size, neighbors are the best guide. Ask them anything.
Moving to Lake Sinai Township: who provides what
Who provides power, water and the rest in Lake Sinai Township, and how to reach them.
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 Lake Sinai Township.
86% of residents are 65 or older
People 65 and older are 86% of residents (18% statewide); adults 35 to 64 are 6% of residents (36% statewide). Lake Sinai Township has grown 9.6% since 2020, to 183 residents in the Census Bureau’s 2025 estimate. 37% of Lake Sinai Township adults 25 and older hold a bachelor’s degree or more.
Ages · share of residents
Education · adults 25 and older
Women and men · all residents
43% women, 57% men
About 133 men for every 100 women (the survey’s margin: ±6.7 points). Across South Dakota, 49.2% of residents are women.
| Lake Sinai Township | SD | U.S. | |
|---|---|---|---|
| Under 10 | 0% | 13.1% | 11.6% |
| 10 to 17 | 3.2% | 11.2% | 10.3% |
| 18 to 24 | 5.1% | 9.3% | 9.1% |
| 25 to 34 | 0% | 12.6% | 13.7% |
| 35 to 44 | 0% | 12.6% | 13.2% |
| 45 to 54 | 5.8% | 10.7% | 12.2% |
| 55 to 64 | 0% | 12.6% | 12.7% |
| 65 to 74 | 78.8% | 11% | 10.2% |
| 75 and older | 7.1% | 7% | 7% |
| No diploma | 0% | 6.8% | 10.4% |
| High school | 42.7% | 29% | 26% |
| Some college | 17.5% | 19.9% | 19.1% |
| Associate’s | 2.8% | 12.3% | 8.8% |
| Bachelor’s | 37.1% | 21.9% | 21.6% |
| Graduate | 0% | 10% | 14.1% |
Census population estimates, 2025 · U.S. Census Bureau · ACS 2020-2024 5-year estimates · in a town of 200, single groups can be off by several points
About half of Lake Sinai Township’s working residents commute to Brookings
Most working residents leave Lake Sinai Township for work: only 0% work in town. The top destinations are Brookings (46%), Volga (6%) and Sioux Falls (5%). Half commute less than 15 miles.
Where working residents work
Census LEHD 2023 · ACS
Conserved land covers 18.4% of Lake Sinai Township
1.5 miles of trail in 0 parks and preserves.
Trails & parks © OpenStreetMap contributors · Conserved land: USGS PAD-US
Four seasons and pleasant summers in Lake Sinai Township
Lake Sinai Township has cold, snowy winters and pleasant summers. The July high in Lake Sinai Township is 82°F.
Typical low → high °F
NOAA U.S. Climate Normals, 1991–2020
How healthy Lake Sinai Township is
Lake Sinai Township beats the South Dakota average on 4 of 26 CDC measures and trails it on 1. 29% of adults sleep under 7 hours in Lake Sinai Township.
| Lake Sinai Township | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Sleep under 7 hours (CDC PLACES) | 29% | 30% | 36% |
| Frequent mental distress (CDC PLACES) | 14% | 15% | 17% |
| Binge drink (CDC PLACES) | 19% | 19% | 16% |
| Depression (CDC PLACES) | 21% | 22% | 23% |
| What stands out | Lake Sinai Township | SD |
|---|---|---|
| Fewer older adults who have lost all their teeth | 9% | 12.7% |
| More adults screened for colon cancer | 70.5% | 65.5% |
| More adults who have had cancer | 10.3% | 9.2% |
CDC PLACES 2025 · modeled estimates for adults · CMS · HRSA
Moderate risk in Lake Sinai Township, with inland flooding at the top
Expected storm and flood damage is higher than in 57% of U.S. communities.
FEMA National Risk Index · OpenFEMA
Everything we know about Lake Sinai Township
Colleges nearby
2 within 15 miles of the center of Lake Sinai Township
About 0 of every 100 Lake Sinai Township residents are enrolled in college, against 5 across South Dakota.
100% of working residents leave Lake Sinai Township for work
Where Lake Sinai Township’s working residents go each day. Line width shows the share.
Census LEHD 2023
Questions about Lake Sinai Township
Short answers, built from the data on this page.
Is Lake Sinai Township, SD a good place to live?
Lake Sinai Township has fewer than 1,000 residents, too few for fair grades; the figures below are still real.