What is the population of Keystone?

The population of Keystone, SD is 352.

Where is Keystone located?

Keystone, SD is located at latitude 43.8955400 and longitude -103.4182500. It is in United States.

What is the area of Keystone?

The area of Keystone, SD is 7.407063 km².

What is the elevation of Keystone?

Keystone, SD has an elevation of 1320 meters (4331 feet) above sea level.

What time zone is Keystone in?

Keystone, SD is in the America/Denver time zone.

What state is Keystone in?

Keystone is in the state of South Dakota, United States.

What county is Keystone, SD in?

Keystone is in Pennington County, South Dakota.

How has the population of Keystone changed?

The population of Keystone, SD has increased from 337 (2010) to 352 (2020), a change of 4.5%.

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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 143 years ago in 1882.

Keystone locator map — Location of Keystone on South Dakota map.

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
Latitude & Longitude	43.8955,-103.4183
Altitude	4,331 feet / 1320 meters
Establishment	January 01, 1883 (143 years ago)
Time Zone	America/Denver
Local time	21:24:49 (22nd April 2026)
Density	48 Pop. per km² as of 2020
Population growth	4.26% (2010-2020)
Weather	57℉ Partly Cloudy 7-days weather

Keystone South Dakota business district 3-3-2012 image

Geography

Keystone is located at 43°53'44"N 103°25'6"W (43.8955400, -103.4182500).

Keystone map

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Weather

57°F

Partly Cloudy

5 mph SW Tonight

Partly cloudy, with a low around 57. Southwest wind around 5 mph.

7-Day Forecast

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

Keystone zip code is 57751. County name: Pennington, County fips: 46103

People born in Keystone (1)

United States Air Force officer C. D. Moore was born in Keystone

Nearby Schools and Colleges

Schools and campuses linked to Keystone, SD. Select a name to open its map and contact details.

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

Nearby Post Offices

Closest post offices linked to Keystone.

Post Office Name	City	ZIP
Keyston Post Office	Keystone (SD)	57751

Other places with the same name (3)

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
Conata	7	Township in Pennington County, South Dakota
Imlay	7	Township in Pennington County, South Dakota