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2025 Compare Cities People:
South San Francisco, CA vs Union City, CA

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Highlights
- Union City is 0% more densely populated than South San Francisco.
- People are 7.4% more likely to be married in Union City.
- The Median Age is 1.3 years younger in Union City.
 South San Francisco, CAUnion City, CAUnited States
 Population  Unlock70,828329,725,481
 Female Population49.8%  Unlock50.5%
 Male Population50.2%  Unlock49.5%
 Median Age  Unlock40.838.4
 space3
 Population - 201063,674  Unlock309,327,143
 Population - 2000  Unlock66,869285,036,114
 Population - 199054,312  Unlock251,960,433
 Pop. 2000 to Now  Unlock11.4%15.6%
 Pop. 1990 to Now22.6%  Unlock30.8%
 space4
 Population Density  Unlock3,650.993.4
 Land Area9.2  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 South San Francisco, CAUnion City, CAUnited States
 Age 0 to 44.6%  Unlock5.9%
 Age 5 to 9  Unlock5.0%6.1%
 Age 10 to 144.9%  Unlock6.6%
 Age 15 to 17  Unlock3.0%3.9%
 Age 18 to 203.1%  Unlock4.0%
 Age 21 to 24  Unlock4.9%5.2%
 Age 25 to 3414.4%  Unlock13.8%
 Age 35 to 44  Unlock14.8%12.9%
 Age 45 to 5414.8%  Unlock12.6%
 Age 55 to 59  Unlock7.0%6.7%
 Age 60 to 647.2%  Unlock6.3%
 Age 65 to 74  Unlock9.9%9.6%
 Age 75 to 844.4%  Unlock4.5%
 Age 85 and over  Unlock2.2%1.9%
 space1
 Race
 South San Francisco, CAUnion City, CAUnited States
 White21.5%  Unlock59.4%
 Black  Unlock4.7%12.2%
 Asian42.8%  Unlock5.6%
 Native American  Unlock0.3%0.6%
 Hawaiian, Pacific Islander0.9%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races2.9%  Unlock3.2%
 Hispanic  Unlock20.3%18.4%
 space2
 Marriage & Family
 South San Francisco, CAUnion City, CAUnited States
 Married Population53.3%  Unlock49.8%
     Currently Married  Unlock56.1%48.0%
 Married but Separated1.4%  Unlock1.8%
 Single Population  Unlock42.8%50.2%
 Never Married33.3%  Unlock33.8%
 Divorced  Unlock6.4%10.8%
 Widowed5.3%  Unlock5.6%
 space5
 Household Size  Unlock3.372.60
 Households21,895  Unlock124,010,992
 Family Households  Unlock16,97980,755,759
     Married couple, w/children31.7%  Unlock30.5%
     Married couple, no children  Unlock46.1%42.9%
 Non Family Households5,831  Unlock43,255,233
     Single householder, w/children  Unlock7.9%15.8%
     Single householder, no children15.6%  Unlock10.8%
Voting
Reviews for South San Francisco    5 Reviews
kim · South San Francisco, CA
SSF is probably the most misunderstood city in the
Over 12 years ago

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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Dawn · South San Francisco, CA
Cloudy Days
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

   |    Reply
Thanwa · Elk Grove, CA
Bayview Hunters Point
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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Reviews for Union City    1 Reviews
Miriam · Union City, CA
hello from Union City
Over 19 years ago

Hi, I am looking for a small, friendly town with low crime and friendly people, outdoor activites, mellow, etc. (in the bay area). I am currently hoping to move to  More

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Learn More About South San Francisco, California
Overview
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Learn More About Union City, California
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