Statistic Keystone South Dakota National
Population 542 884,659 328,239,523
Population density (sq mi) 181 12 91
Median age 30.0 36.8 37.7
Male/Female ratio 1.2:1 1.0:1 1.0:1
Married (15yrs & older) 45% 59% 55%
Families w/ Kids under 18 49% 44% 43%
Speak English 78% 94% 79%
Speak Spanish 19% 2% 13%
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Demographics Quick Facts

  • The population density in Keystone is 1406% higher than South Dakota
  • The median age in Keystone is 18% lower than South Dakota
  • In Keystone 87.64% of the population is White
  • In Keystone 0.00% of the population is Black
  • In Keystone 0.92% of the population is Asian

Compare Keystone, SD Demographics

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      Keystone racial demographics

      Race Keystone South Dakota National
      White 87.64% 84.77% 73.35%
      Black 0.00% 1.65% 12.63%
      Asian 0.92% 1.33% 5.22%
      American Indian 2.03% 8.72% 0.82%
      Native Hawaiian 0.37% 0.04% 0.18%
      Mixed race 8.67% 2.61% 3.06%
      Other race 0.37% 0.88% 4.75%
      In Keystone, 19.6% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Keystone age breakdown

      Marital status

      Age of children in married couples

      Source: The Keystone, SD demographics data displayed above is derived from the United States Census Bureau American Community Survey (ACS).