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

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Highlights
- Seneca is 0% more densely populated than Onida.
- People are 7.7% more likely to be married in Seneca.
- The Median Age is 16.0 years older in Seneca.
 Onida, SDSeneca, SDUnited States
 Population  Unlock41329,725,481
 Female Population46.2%  Unlock50.5%
 Male Population53.8%  Unlock49.5%
 Median Age  Unlock63.938.4
 space3
 Population - 2010663  Unlock309,327,143
 Population - 2000  Unlock58285,036,114
 Population - 1990761  Unlock251,960,433
 Pop. 2000 to Now  Unlock-36.2%15.6%
 Pop. 1990 to Now-17.5%  Unlock30.8%
 space4
 Population Density  Unlock97.993.4
 Land Area0.7  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Onida, SDSeneca, SDUnited States
 Age 0 to 48.1%  Unlock5.9%
 Age 5 to 9  Unlock0.0%6.1%
 Age 10 to 147.4%  Unlock6.6%
 Age 15 to 17  Unlock4.9%3.9%
 Age 18 to 200.9%  Unlock4.0%
 Age 21 to 24  Unlock0.0%5.2%
 Age 25 to 3411.0%  Unlock13.8%
 Age 35 to 44  Unlock2.4%12.9%
 Age 45 to 5411.6%  Unlock12.6%
 Age 55 to 59  Unlock12.2%6.7%
 Age 60 to 6410.9%  Unlock6.3%
 Age 65 to 74  Unlock14.6%9.6%
 Age 75 to 8412.4%  Unlock4.5%
 Age 85 and over  Unlock0.0%1.9%
 space1
 Race
 Onida, SDSeneca, SDUnited States
 White92.9%  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 Races3.6%  Unlock3.2%
 Hispanic  Unlock0.0%18.4%
 space2
 Marriage & Family
 Onida, SDSeneca, SDUnited States
 Married Population56.6%  Unlock49.8%
     Currently Married  Unlock61.0%48.0%
 Married but Separated0.0%  Unlock1.8%
 Single Population  Unlock39.0%50.2%
 Never Married24.2%  Unlock33.8%
 Divorced  Unlock12.2%10.8%
 Widowed5.7%  Unlock5.6%
 space5
 Household Size  Unlock2.282.60
 Households258  Unlock124,010,992
 Family Households  Unlock880,755,759
     Married couple, w/children19.7%  Unlock30.5%
     Married couple, no children  Unlock75.0%42.9%
 Non Family Households121  Unlock43,255,233
     Single householder, w/children  Unlock0.0%15.8%
     Single householder, no children1.5%  Unlock10.8%
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Learn More About Onida, South Dakota
Overview
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Learn More About Seneca, South Dakota
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