Castlewood TownshipSD
A town of 272.
Is Castlewood Township a good place to live?
Castlewood Township has fewer than 1,000 residents, too few for fair grades; the figures below are still real.
272 people, and everyone knows the way
In a town this size, neighbors are the best guide. Ask them anything.
Moving to Castlewood Township: who provides what
Who provides power, water and the rest in Castlewood 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 Castlewood Township.
More children than South Dakota overall
Children under 18 are 43% of residents (24% statewide); adults 18 to 34 are 9% of residents (22% statewide). 272 people lived in Castlewood Township by the Census Bureau’s 2025 estimate, 13% more than in 2020. Its midpoint age stands at 32.4 years, against 39.5 years in South Dakota’s towns and 40.5 years across U.S. towns. Here, just over a third of adults 25 and older have a bachelor’s degree, against 32% in South Dakota as a whole.
| Castlewood Township | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Median age | 32.4 years | 39.5 years | 40.5 years |
| Bachelor’s degree or more, 25+ | 35% | 33% | 29% |
Ages · share of residents
Education · adults 25 and older
Women and men · all residents
42% women, 58% men
About 141 men for every 100 women (the survey’s margin: ±7 points). Across South Dakota, 49.2% of residents are women.
| Castlewood Township | SD | U.S. | |
|---|---|---|---|
| Under 10 | 20.2% | 13.1% | 11.6% |
| 10 to 17 | 22.3% | 11.2% | 10.3% |
| 18 to 24 | 0% | 9.3% | 9.1% |
| 25 to 34 | 8.8% | 12.6% | 13.7% |
| 35 to 44 | 22.8% | 12.6% | 13.2% |
| 45 to 54 | 1% | 10.7% | 12.2% |
| 55 to 64 | 9.8% | 12.6% | 12.7% |
| 65 to 74 | 7.3% | 11% | 10.2% |
| 75 and older | 7.8% | 7% | 7% |
| No diploma | 0% | 6.8% | 10.4% |
| High school | 23.4% | 29% | 26% |
| Some college | 27% | 19.9% | 19.1% |
| Associate’s | 14.4% | 12.3% | 8.8% |
| Bachelor’s | 32.4% | 21.9% | 21.6% |
| Graduate | 2.7% | 10% | 14.1% |
Census population estimates, 2025 · U.S. Census Bureau · ACS 2020-2024 5-year estimates · in a town of 300, single groups can be off by several points
Castlewood Township stands out in South Dakota and nationally, with the median household income higher than most
The average trip to work in Castlewood Township is 29 minutes. In Castlewood Township, 2.1% of residents live below the poverty line, below both the South Dakota town median (9.5%) and the median of U.S. towns (9.6%). Among 36 South Dakota towns, just one has a lower share of working residents who work in town than Castlewood Township. The top destinations are Brookings (14%), Watertown (14%) and Estelline (11%).
| Castlewood Township | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Median household income | $157,000 | $72,000 | $80,000 |
| Working residents who work in town | 1% | 29% | 8% |
| Average trip to work | 29 minutes | 17 minutes | 25 minutes |
| Below the poverty line | 2.1% | 9.5% | 9.6% |
Where working residents work
Census LEHD 2023 · ACS
Snowy winters and pleasant summers in Castlewood Township
In Castlewood Township, the peak summer temperature is 82°F.
Typical low → high °F
NOAA U.S. Climate Normals, 1991–2020
How healthy Castlewood Township is
For adults in Castlewood Township, the share who report frequent mental distress is 15%. This South Dakota town tracks South Dakota closely on all 26 CDC measures.
| Castlewood Township | South Dakota towns | U.S. towns | |
|---|---|---|---|
| Depression (CDC PLACES) | 20% | 22% | 23% |
| Frequent mental distress (CDC PLACES) | 15% | 15% | 17% |
| Sleep under 7 hours (CDC PLACES) | 31% | 30% | 36% |
| Binge drink (CDC PLACES) | 19% | 19% | 16% |
CDC PLACES 2025 · modeled estimates for adults · CMS · HRSA
Castlewood Township has a moderate natural-hazard risk, chiefly from inland flooding
Castlewood Township’s risk rating from FEMA comes in at 58 of 100. 46% of the town’s expected losses from natural hazards come from inland flooding, followed by cold waves at 18%. Federal disaster aid has reached households in Castlewood Township after 4 declared disasters, most recently in 2019.
FEMA disaster declarations and aid · FEMA National Risk Index · OpenFEMA
Everything we know about Castlewood Township
Colleges nearby
1 within 15 miles of the center of Castlewood Township
About 0 of every 100 Castlewood Township residents are enrolled in college, against 5 across South Dakota.
99% of working residents leave Castlewood Township for work
Where Castlewood Township’s working residents go each day. Line width shows the share.
Census LEHD 2023
About Castlewood Township
City in South Dakota, United States
Castlewood is a city in Hamlin County, South Dakota, United States. It is part of the Watertown, South Dakota Micropolitan Statistical Area. The population was 698 at the 2020 census, and was estimated to be 707 in 2022.
From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)
- Area
- 1.2 sq mi
- Elevation
- 1,686 ft
- ZIP code
- 57223
- Area code
- 605
Questions about Castlewood Township
Short answers, built from the data on this page.
Is Castlewood Township, SD a good place to live?
Castlewood Township has fewer than 1,000 residents, too few for fair grades; the figures below are still real.