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Summary for Keystone

About Keystone (Click for our profile page)

Located in: Pennington County (see below)

Time Zone: Keystone lies in the Mountain Time Zone (MST/MDT)

Telephone Area Code: 605

ZIP Code: 57751<1>

Elevation: 4,360 feet [1,328.93 m] above sea level<2>

From the 2010 US Census (For more detail, see our Census Page for Keystone)

Population

Year	Population
2019 Est:<3>	345 (2.37% increase since 2010)
2010:	337 (8.36% increase since 2000)
2000:	311

Total Area:<4> 2.86 sq. miles [7.4 km²]

Housing Units:<5> 230

GPS Coordinates (Latitude/Longitude)<6>

For the purpose of mapping and calculating distances, we have chosen the following reference point for Keystone:

Lat: 43.895500° (or 43°53'43" N)

Lon: -103.419000° (or -103°25'8" W)

USGS Topo Map: Mount Rushmore<7>

Federal GNIS/FIPS Codes for Keystone

GNIS ID: 1267444

FIPS State / Place Code: 46 / 33820

(For more about Federal Codes, see our Misc Page for Keystone)

About Pennington County

The town of Rapid City is the County Seat for {Pennington County}.

From the 2010 US Census (For more detail, see our Census Page for Pennington)

Population

Year	Population
2019 Est:	113,775 (12.38% increase since 2010)
2010	101,243 (14.31% increase since 2000)
2000:	88,565

Total Area: 2,784 sq. miles [7,211.2 km²]

Housing Units: 44,949

Official Website: https://pennco.org/

Federal GNIS/FIPS Codes for Pennington

GNIS ID: 1266995

FIPS State / County Code: 46 / 103

(For more about Federal Codes, see our Misc Page for Keystone)

About South Dakota

From the US Census

Population

Year	Population
2019 Est:	887,127 (8.96% increase since 2010)
2010:	814,180 (7.86% increase since 2000)
2000:	754,844

Websites for State of South Dakota

Official Website: https://www.sd.gov/

Tourism: https://www.travelsouthdakota.com/

Parks: https://gfp.sd.gov/parks/

Fishing: https://gfp.sd.gov/fish/

Hunting: https://gfp.sd.gov/hunt/

Federal GNIS/FIPS Codes for State of South Dakota

GNIS ID: 1785534

FIPS State: 46

(For more about Federal Codes, see our Misc Page for Keystone)

Footnotes ...

<1>	ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a town (such as Keystone). When looking for a ZIP Code, whether Keystone or elsewhere, it's always best to check the website of the United States Postal Service (USPS).
<2>	The elevation is an estimate for the area around Keystone - it will be higher in some places and lower in others.
<3>	Every year, the US Census Bureau creates a population estimate for the preceeding year. Keep in mind that this value is an estimate and not an actual count. The most recent Census estimate is for the year 2019.
<4>	The area value has been supplied by the US Census Bureau and it can be different than the geographic boundaries of Keystone. The value given by the Census Bureau reflects their statistical (or sampling) requirements. For example, if there is a cluster of people living just outside of the community's official boundary, the Census-defined area might be expanded to include that group.
<5>	A Housing Unit is a broad term for those places where people live (whether occupied or temporarily vacant), such as a house, an apartment, a mobile home, or an area that is considered as a separate living quarter. Separate living quarters (consisting of one or more rooms) are considered to be those places where people live, sleep and eat separately from others and that have access to the outside (either directly or by a shared hallway).
<6>	Longitude & latitude values may not be the geographic center of Keystone, rather it may be a prominent intersection or the center of population, etc. It will vary depending on the source.
<7>	Name of the USGS 7.5 Minute topographic map which includes Keystone.