2025 Compare Cities People:
Seneca, SD vs Onida, SD

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Highlights
- Onida is 0% more densely populated than Seneca.
- People are 7.2% less likely to be married in Onida.
- The Median Age is 16.0 years younger in Onida.
 Seneca, SDOnida, SDUnited States
 Population  Unlock580329,725,481
 Female Population41.5%  Unlock50.5%
 Male Population58.5%  Unlock49.5%
 Median Age  Unlock47.938.4
 space3
 Population - 201038  Unlock309,327,143
 Population - 2000  Unlock740285,036,114
 Population - 199081  Unlock251,960,433
 Pop. 2000 to Now  Unlock-15.1%15.6%
 Pop. 1990 to Now-54.3%  Unlock30.8%
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 Population Density  Unlock863.193.4
 Land Area0.4  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
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 Est. Total Population By Age
 Seneca, SDOnida, SDUnited States
 Age 0 to 40.0%  Unlock5.9%
 Age 5 to 9  Unlock6.2%6.1%
 Age 10 to 140.0%  Unlock6.6%
 Age 15 to 17  Unlock3.8%3.9%
 Age 18 to 200.0%  Unlock4.0%
 Age 21 to 24  Unlock3.3%5.2%
 Age 25 to 340.0%  Unlock13.8%
 Age 35 to 44  Unlock7.1%12.9%
 Age 45 to 549.8%  Unlock12.6%
 Age 55 to 59  Unlock8.4%6.7%
 Age 60 to 6426.8%  Unlock6.3%
 Age 65 to 74  Unlock7.1%9.6%
 Age 75 to 8429.3%  Unlock4.5%
 Age 85 and over  Unlock1.9%1.9%
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 Race
 Seneca, SDOnida, SDUnited States
 White100.0%  Unlock59.4%
 Black  Unlock0.0%12.2%
 Asian0.0%  Unlock5.6%
 Native American  Unlock0.0%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races0.0%  Unlock3.2%
 Hispanic  Unlock3.4%18.4%
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 Marriage & Family
 Seneca, SDOnida, SDUnited States
 Married Population61.0%  Unlock49.8%
     Currently Married  Unlock56.6%48.0%
 Married but Separated0.0%  Unlock1.8%
 Single Population  Unlock43.4%50.2%
 Never Married26.8%  Unlock33.8%
 Divorced  Unlock13.4%10.8%
 Widowed0.0%  Unlock5.6%
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 Household Size  Unlock2.252.60
 Households18  Unlock124,010,992
 Family Households  Unlock13780,755,759
     Married couple, w/children12.5%  Unlock30.5%
     Married couple, no children  Unlock71.5%42.9%
 Non Family Households10  Unlock43,255,233
     Single householder, w/children  Unlock7.3%15.8%
     Single householder, no children12.5%  Unlock10.8%
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