Seneca demographics profile

StatisticSenecaSouth DakotaNational
Population density (sq mi)211191
Median age74.336.837.7
Male/Female ratio0.8:11.0:11.0:1
Married (15yrs & older)78%59%55%
Families w/ Kids under 180%44%43%
Speak English100%94%79%
Speak Spanish0%2%13%
Seneca, SD has a population of 9 and is the 28,980th largest city in the United States. The population density is 21 per sq mi which is 99% higher than the South Dakota average and 76% lower than the national average. The median age in Seneca is 74 which is approximately 102% higher than the South Dakota average of 37. In Seneca, 78% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 100% of Seneca residents were born in South Dakota, 0% were born out of state, 0% were born outside of the United States and 0% were foreign born.

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Did you know?

  • The population density in Seneca is 99% higher than South Dakota.
  • The median age in Seneca is 102% higher than South Dakota.
  • In Seneca 100.00% of the population is White.
  • In Seneca 0.00% of the population is Black or African American.
  • In Seneca 0.00% of the population is Asian.

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Seneca population breakdown by race

RaceSenecaSouth DakotaNational
Black or African American0.00%1.65%12.63%
American Indian0.00%8.72%0.82%
Native Hawaiian0.00%0.04%0.18%
Mixed race0.00%2.61%3.06%
Other race0.00%0.88%4.75%
In Seneca, 0.0% 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.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

Seneca age breakdown

Marital status

Age of children in married couples

Source: The Seneca, SD demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).