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The total population of Seneca is estimated to be 42 with 27 males (64.29%) and 15 females (35.71%). There are 12 less females than males in Seneca.
In 2022, the population of Seneca was 22, a 0.00% decrease year-by-year from 2021. Previously, in 2021, Seneca's population was 22, a decline of 0.00% compared to a population of 22 in 2020.
The median age in Seneca, SD is 63.9, as per 2021 ACS 5-Year Estimates. Of the total population, 0.00% were under the age of 15, 4.88% aged 15 to 29, 51.22% aged 30 to 64, 43.90% aged 65 to 84, and 0.00% were 85 years of age and older.
Racial distribution of Seneca population: 100% are White.