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2025 Compare Cities People:
Castro Valley, CA vs Rapid City, SD

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Highlights
- Rapid City is 0% more densely populated than Castro Valley.
- People are 17.8% less likely to be married in Rapid City.
- The Median Age is 4.3 years younger in Rapid City.
 Castro Valley, CARapid City, SDUnited States
 Population  Unlock73,942329,725,481
 Female Population51.4%  Unlock50.5%
 Male Population48.6%  Unlock49.5%
 Median Age  Unlock38.138.4
 space3
 Population - 201060,625  Unlock309,327,143
 Population - 2000  Unlock59,607285,036,114
 Population - 199048,619  Unlock251,960,433
 Pop. 2000 to Now  Unlock32.3%15.6%
 Pop. 1990 to Now33.1%  Unlock30.8%
 space4
 Population Density  Unlock1,356.193.4
 Land Area16.6  Unlock3,531,905.4
 Water Area  Unlock0.1264,836.8
 space
 Est. Total Population By Age
 Castro Valley, CARapid City, SDUnited States
 Age 0 to 45.1%  Unlock5.9%
 Age 5 to 9  Unlock6.1%6.1%
 Age 10 to 145.5%  Unlock6.6%
 Age 15 to 17  Unlock3.6%3.9%
 Age 18 to 201.9%  Unlock4.0%
 Age 21 to 24  Unlock5.2%5.2%
 Age 25 to 3412.2%  Unlock13.8%
 Age 35 to 44  Unlock12.2%12.9%
 Age 45 to 5414.3%  Unlock12.6%
 Age 55 to 59  Unlock6.1%6.7%
 Age 60 to 647.5%  Unlock6.3%
 Age 65 to 74  Unlock11.5%9.6%
 Age 75 to 844.4%  Unlock4.5%
 Age 85 and over  Unlock2.3%1.9%
 space1
 Race
 Castro Valley, CARapid City, SDUnited States
 White36.7%  Unlock59.4%
 Black  Unlock1.4%12.2%
 Asian31.2%  Unlock5.6%
 Native American  Unlock8.1%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock0.6%0.4%
 Two or More Races4.8%  Unlock3.2%
 Hispanic  Unlock5.9%18.4%
 space2
 Marriage & Family
 Castro Valley, CARapid City, SDUnited States
 Married Population55.8%  Unlock49.8%
     Currently Married  Unlock44.6%48.0%
 Married but Separated1.3%  Unlock1.8%
 Single Population  Unlock54.1%50.2%
 Never Married29.8%  Unlock33.8%
 Divorced  Unlock15.0%10.8%
 Widowed6.0%  Unlock5.6%
 space5
 Household Size  Unlock2.292.60
 Households22,467  Unlock124,010,992
 Family Households  Unlock16,97080,755,759
     Married couple, w/children35.0%  Unlock30.5%
     Married couple, no children  Unlock47.9%42.9%
 Non Family Households5,775  Unlock43,255,233
     Single householder, w/children  Unlock16.8%15.8%
     Single householder, no children8.5%  Unlock10.8%
Voting
Reviews for Castro Valley    7 Reviews
Ken · Walnut Creek, CA
2015 review of Castro Valley, CA
Over 10 years ago

CURMUDGEON - THANK YOU for your post. The most important part of your comment is your second paragraph. "Hodge-Podge" is the correct word for a lot of Castro  More

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Doug · Castro Valley, CA
Close to the big cities
Over 11 years ago

Kind of rural but close to Oakland and San  More

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Curmudgeon · Castro Valley, CA
Castro Valley Needs to Incorporate
Over 12 years ago

Castro Valley is the largest unincorporated "city" in the Bay Area. Over the years, several attempts have been made to incorporate, but they have all been defeated at  More

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Reviews for Rapid City    31 Reviews
PJ · Amarillo, TX
Don't let the name City deceive you. It's a Town!!
Over 1 years ago

I have lived in this city for the last three and half years and I can't stand it!! Let me spell it out for you, but to be fair, let me give you the Pros first:  More

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Jacob · Eugene, OR
Black Hills are beautiful in summer.
Over 4 years ago

Unless you made your pension out of state or already bought a home you can't afford to liver there. Rapid City is gray in winter.  More

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Dee · Beverly Hills, CA
Title
Over 4 years ago

I've lived in the city 5 years a loved  More

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Learn More About Castro Valley, California
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