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Keystone, SD
Town in Pennington County, South Dakota.
Population
336
Land area
3sq mi
People per sq mi
112
ZIP codes
0
Keystone and its ZIP codes
Keystone at a glance
- Keystone is about 9.4 times as dense as South Dakota as a whole.
Local data for Keystone, SD
Counts from official public data
Economy and federal money
Jobs, pay, income and spending are for Pennington County. PPP loans are for Keystone.
Unemployment rate
1.7%
Sep 2026, -0.1 pts in a year
Average annual pay
$59,768
62,445 jobs, 2025
Income per person
$78,464
BEA, 2024
Federal spending
$1B
FY 2026, $9,179 per person
Environment and hazard risk
Keystone, SD, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: wildfire
Storm events since 1996
3,274
Countywide, mostly hail
Flood insurance policies
253
0.6% of homes, county
July high / Jan low
79° / 19°F
24.1 inches of rain a year
Hazards, floods and storm historyCheck a flood zone3 historic places
Health statistics
Share of adults in Keystone, SD, CDC PLACES estimates
Obesity
31.6%
U.S. 33.3% -1.7 pts
Diabetes
12.6%
U.S. 12.1% +0.5 pts
Smoking
11.8%
U.S. 12.8% -1.0 pts
Uninsured (18-64)
7.5%
U.S. 11.1% -3.6 pts
Cities near Keystone
| Name | Distance | Land area (sq mi) |
|---|---|---|
| Hill CityCity | 8 mi | 1.3 |
| Colonial Pine HillsCensus-designated place | 9.9 mi | 15.3 |
| HermosaTown | 12 mi | 0.9 |
| CusterCity | 12 mi | 2.6 |
| Johnson SidingCensus-designated place | 14 mi | 3.7 |
| Rapid CityCity | 16 mi | 56 |
| FairburnTown | 18 mi | 0.3 |
| Green ValleyCensus-designated place | 19 mi | 3.8 |
| BlackhawkCensus-designated place | 19 mi | 4.7 |
| Rapid ValleyCensus-designated place | 19 mi | 6.4 |
| PringleTown | 21 mi | 0.2 |
| SummersetCity | 21 mi | 2.7 |
| Wonderland HomesCensus-designated place | 22 mi | 0.2 |
| Ashland HeightsCensus-designated place | 22 mi | 2.9 |
| PiedmontCity | 23 mi | 1.6 |
| CaputaCensus-designated place | 23 mi | 0.3 |
Frequently asked questions
- What county is Keystone, SD in?
- Keystone is in Pennington County, South Dakota.
- What is the population of Keystone, SD?
- About 336 people live in Keystone, based on American Community Survey 5-year estimates.
- What cities are near Keystone?
- Nearby places include Hill City (8 mi), Colonial Pine Hills (9.9 mi), Hermosa (12 mi), Custer (12 mi), Johnson Siding (14 mi).
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023