Keystone, SD Profile: Facts, Map & Data


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Keystone, South Dakota - Basic Facts

The Town of Keystone had a population of 353 as of July 1, 2017. 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, 2017.

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Town of Keystone, SD Boundary Map

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Keystone, SD Data & Demographics (As of July 1, 2017)


Total Population 353
Daytime Population: Workers 762
Daytime Population: Residents 131
Total Daytime Population (TDP) 893
Ratio TDP/Total Population1 2.53
Population in Households 351
Population in Familes 268
Population in Group Qrtrs 2
Population Density2 123
Diversity Index3 22


Median Household Income $49,407
Average Household Income $85,804
Per Capita Income $37,805


Total Housing Units 242 (100%)
Owner Occupied HU 112 (46.3%)
Renter Occupied HU 50 (20.7%)
Vacant Housing Units 80 (33.1%)
Median Home Value $259,375
Average Home Value $297,523


Total Households 162
Average Household Size 2.17
Family Households 102
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood 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.


2010-2017 2017-2022
Population 0.64% 0.84%
Households 0.79% 0.85%
Families 3.23% 0.77%
Median Household Income   9.31%
Per Capita Income   4.09%

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, 2017 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 Density # 312 20th
Diversity Index # 116 71st
Median Household Income # 214 46th
Per Capita Income # 13 97th

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

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