Keystone, South Dakota
Keystone: Town in Pennington County, South Dakota
About
Keystone is a town located in the county of Pennington in the U.S. state of South Dakota. Its population at the 2010 census was 337 and a population density of 45 people per km². After 10 years in 2020 city had an estimated population of 352 inhabitants.
The town was created 142 years ago in 1882.
Quick Facts about Keystone
| Population : | 352 (2020) |
| Country : | United States of America |
| State : | South Dakota (United States) |
| County : | Pennington County |
| Postal code : | 57751 |
| Phone Area Codes : | 605 |
| Area : | 7.41 km2 |
| Altitude : | 4,331 feet / 1320 meters |
| Establishment : | January 01, 1883 (142 years ago) |
| Time Zone : | America/Denver |
| Local time : | 07:33:27 (5th December 2025) |
| Density : | 48 Pop. per km² as of 2020 |
| Population growth : | 4.26% (2010-2020) |
Geography
Keystone is located at 43°53'44"N 103°25'6"W (43.8955400, -103.4182500).
Keystone map
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Demographics
The population of Keystone increased by 4.26% in 10 years.
| Year | Population | % Change | Method |
| 2010 | 337 | - | census |
| 2011 | 335 | -0.6% | estimation process |
| 2012 | 340 | 1.47% | estimation process |
| 2013 | 341 | 0.29% | estimation process |
| 2014 | 341 | 0% | estimation process |
| 2015 | 340 | -0.29% | estimation process |
| 2016 | 339 | -0.29% | estimation process |
| 2017 | 339 | 0% | estimation process |
| 2018 | 340 | 0.29% | estimation process |
| 2019 | 343 | 0.87% | estimation process |
| 2020 | 352 | 2.56% | estimation process |
People born in Keystone (1)
United States Air Force officer C. D. Moore was born in Keystone
Schools in Keystone
College & universities near Keystone, SD
| Code | Name | City | ZIP |
|---|---|---|---|
| 219204 | National American University-Rapid City | Rapid City (SD) | 57701-2823 |
| 485290 | National American University-Harold D. Buckingham Graduate School | Rapid City (SD) | 57701-2823 |
| 219037 | The Salon Professional Academy | Rapid City (SD) | 57701 |
| 219125 | Headlines Academy Inc | Rapid City (SD) | 57701 |
| 219347 | South Dakota School of Mines and Technology | Rapid City (SD) | 57701-3995 |
Post offices near Keystone
| Post Office Name | City | ZIP |
|---|---|---|
| Keyston Post Office | Keystone (SD) | 57751 |
Other places with the same name (4)
- Keystone , Florida census-designated place in Hillsborough County, Florida with a population of 24,039 people.
- Keystone , Iowa human settlement in Benton County, Iowa, United States of America with a population of 615 people.
- Keystone , West Virginia city in McDowell County, West Virginia, United States of America with a population of 213 people.
Other cities in Pennington County
Cities, towns, neighborhoods & other populated places in Pennington County , SD.
| City Name | Population | Title |
|---|---|---|
| Rapid City | 77,503 | The second most populous city in South Dakota. |
| Rapid Valley | 8,260 | Census-designated place in Pennington County, South Dakota |
| Box Elder | 7,165 | City in Pennington County, South Dakota, United States |
| Colonial Pine Hills | 2,493 | Township in Pennington County, South Dakota |
| Hill City | 1,032 | City in South Dakota, United States of America |
| Wall | 885 | City in Pennington County, South Dakota, United States |
| Ashland Heights | 754 | Township in Pennington County, South Dakota |
| New Underwood | 679 | Human settlement in Pennington County, South Dakota, United States of America |
| Scenic | 64 | Community in Pennington County, South Dakota, US |
| Green Valley | 49 | Township in Pennington County, South Dakota |
| Owanka | 30 | Township in Pennington County, South Dakota |
| Wasta | 22 | Township in Pennington County, South Dakota |
| Quinn | 12 | Town in South Dakota, United States of America |
