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2026 Compare Cities People:
Holstein, IA vs Rock Valley, IA

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Highlights
- Rock Valley is 0% more densely populated than Holstein.
- People are 21.8% more likely to be married in Rock Valley.
- The Median Age is 6.3 years older in Rock Valley.
 Holstein, IARock Valley, IAUnited States
 Population  Unlock4,018329,725,481
 Female Population50.4%  Unlock50.5%
 Male Population49.6%  Unlock49.5%
 Median Age  Unlock41.338.4
 space3
 Population - 20101,393  Unlock309,327,143
 Population - 2000  Unlock2,702285,036,114
 Population - 19901,449  Unlock251,960,433
 Pop. 2000 to Now  Unlock44.4%15.6%
 Pop. 1990 to Now-5.7%  Unlock30.8%
 space4
 Population Density  Unlock1,196.293.4
 Land Area1.6  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Holstein, IARock Valley, IAUnited States
 Age 0 to 46.0%  Unlock5.9%
 Age 5 to 9  Unlock8.3%6.1%
 Age 10 to 147.8%  Unlock6.6%
 Age 15 to 17  Unlock5.1%3.9%
 Age 18 to 206.4%  Unlock4.0%
 Age 21 to 24  Unlock8.8%5.2%
 Age 25 to 3411.8%  Unlock13.8%
 Age 35 to 44  Unlock15.1%12.9%
 Age 45 to 549.0%  Unlock12.6%
 Age 55 to 59  Unlock3.4%6.7%
 Age 60 to 644.6%  Unlock6.3%
 Age 65 to 74  Unlock8.4%9.6%
 Age 75 to 846.3%  Unlock4.5%
 Age 85 and over  Unlock3.7%1.9%
 space1
 Race
 Holstein, IARock Valley, IAUnited States
 White88.5%  Unlock59.4%
 Black  Unlock0.0%12.2%
 Asian0.1%  Unlock5.6%
 Native American  Unlock0.0%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races1.7%  Unlock3.2%
 Hispanic  Unlock27.8%18.4%
 space2
 Marriage & Family
 Holstein, IARock Valley, IAUnited States
 Married Population45.6%  Unlock49.8%
     Currently Married  Unlock55.1%48.0%
 Married but Separated0.3%  Unlock1.8%
 Single Population  Unlock44.4%50.2%
 Never Married29.8%  Unlock33.8%
 Divorced  Unlock6.4%10.8%
 Widowed10.7%  Unlock5.6%
 space5
 Household Size  Unlock2.542.60
 Households609  Unlock124,010,992
 Family Households  Unlock92680,755,759
     Married couple, w/children19.9%  Unlock30.5%
     Married couple, no children  Unlock49.6%42.9%
 Non Family Households238  Unlock43,255,233
     Single householder, w/children  Unlock5.7%15.8%
     Single householder, no children10.8%  Unlock10.8%
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Learn More About Holstein, Iowa
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