Keystone, SD Profile: Facts, Map & Data


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Keystone, South Dakota - Basic Facts

The Town of Keystone had a population of 366 as of July 1, 2016. Keystone ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in South Dakota. See peer rankings below.

The primary coordinate point for Keystone is located at latitude 43.8955 and longitude -103.4267 in Pennington County. The formal boundaries for the Town of Keystone (see map below) encompass a land area of 2.86 sq. miles and a water area of 0 sq. miles. Pennington County is in the Mountain time zone (GMT -7). The elevation is 4,331 feet.

The Town of Keystone (GNIS ID: 1267444) has a C5 Census Class Code which indicates an active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Beneath the boundary map are tables with Keystone population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

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Town of Keystone, SD Boundary Map

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Keystone, SD Data & Demographics (As of July 1, 2016)


Total Population 366
Population in Households 364
Population in Familes 280
Population in Group Qrtrs 2
Population Density1 128
Diversity Index2 23


Total Households 166
Average Household Size 2.19
Family Households 105
Average Family Size 3


Total Housing Units 250 (100%)
Owner Occupied HU 113 (45.2%)
Renter Occupied HU 53 (21.2%)
Vacant Housing Units 84 (33.6%)
Median Home Value $249,038
Average Home Value $305,973


Median Household Income $45,737
Average Household Income $78,777
Per Capita Income $34,517
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.33% 1.49%
Households 1.31% 1.52%
Families 4.24% 1.3%
Median Household Income   1.28%
Per Capita Income   1.04%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

Keystone, SD - Peer Comparisons by Rank and Percentile

The table below compares Keystone to the other 391 incorporated cities, towns and CDPs in South Dakota by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 177 55th
Population Density1 # 311 21st
Diversity Index2 # 107 73rd
Median Household Income # 226 42nd
Per Capita Income # 22 95th

Additional comparisons and rankings can be made with a VERY EASY TO USE South Dakota Census Data Comparison Tool.

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