2025 Compare Cities People:
Castle Rock, CO vs South San Francisco, CA

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Highlights
- South San Francisco is 0% more densely populated than Castle Rock.
- People are 14.8% less likely to be married in South San Francisco.
- The Median Age is 6.4 years older in South San Francisco.
 Castle Rock, COSouth San Francisco, CAUnited States
 Population  Unlock66,331329,725,481
 Female Population50.4%  Unlock50.5%
 Male Population49.6%  Unlock49.5%
 Median Age  Unlock42.138.4
 space3
 Population - 201048,793  Unlock309,327,143
 Population - 2000  Unlock60,552285,036,114
 Population - 19908,708  Unlock251,960,433
 Pop. 2000 to Now  Unlock9.9%15.6%
 Pop. 1990 to Now710.4%  Unlock30.8%
 space4
 Population Density  Unlock7,189.693.4
 Land Area34.3  Unlock3,531,905.4
 Water Area  Unlock21.0264,836.8
 space
 Est. Total Population By Age
 Castle Rock, COSouth San Francisco, CAUnited States
 Age 0 to 47.4%  Unlock5.9%
 Age 5 to 9  Unlock5.4%6.1%
 Age 10 to 147.2%  Unlock6.6%
 Age 15 to 17  Unlock2.8%3.9%
 Age 18 to 204.1%  Unlock4.0%
 Age 21 to 24  Unlock4.4%5.2%
 Age 25 to 3412.9%  Unlock13.8%
 Age 35 to 44  Unlock14.1%12.9%
 Age 45 to 5414.3%  Unlock12.6%
 Age 55 to 59  Unlock7.6%6.7%
 Age 60 to 644.7%  Unlock6.3%
 Age 65 to 74  Unlock10.1%9.6%
 Age 75 to 843.0%  Unlock4.5%
 Age 85 and over  Unlock2.1%1.9%
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 Race
 Castle Rock, COSouth San Francisco, CAUnited States
 White81.6%  Unlock59.4%
 Black  Unlock1.8%12.2%
 Asian2.0%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races3.8%  Unlock3.2%
 Hispanic  Unlock29.8%18.4%
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 Marriage & Family
 Castle Rock, COSouth San Francisco, CAUnited States
 Married Population62.5%  Unlock49.8%
     Currently Married  Unlock51.9%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock46.7%50.2%
 Never Married24.5%  Unlock33.8%
 Divorced  Unlock8.0%10.8%
 Widowed3.0%  Unlock5.6%
 space5
 Household Size  Unlock3.002.60
 Households24,867  Unlock124,010,992
 Family Households  Unlock16,06480,755,759
     Married couple, w/children48.9%  Unlock30.5%
     Married couple, no children  Unlock43.8%42.9%
 Non Family Households5,755  Unlock43,255,233
     Single householder, w/children  Unlock8.9%15.8%
     Single householder, no children5.1%  Unlock10.8%
Reviews for Castle Rock    12 Reviews

My fiance and I moved here in 2018 shortly after finishing college. I work in Colorado Springs and she works in the Denver area, so Castle Rock was practically our only  More

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Over 7 years ago

I have always been mobile for my career, until I moved to Castle Rock. I've lived in in multiple cities in the Midwest including Chicago and have visited nearly every  More

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Over 11 years ago

we have four seasons, and the rockies are only two hrs.away. so for the outdoors enthusist sking or hiking is like no other place you have been or seen it is hard to  More

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Reviews for South San Francisco    5 Reviews

It's amazing, but many, many people, including people who live in SF, think that SSF is just a part of SF. Not true. We're right across the highway from SFO, which is  More

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Over 17 years ago

One frustrating thing about South City weather is the number of overcast & foggy days, as compared to other nearby cities on the Peninsula. You can literally look  More

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Over 19 years ago

Been living in bayview hunters point for about 12 years now. What I can say that it's a rough place to live, no one cares about us and the mayor of San Francisco  More

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Start Your Review of South San Francisco


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