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2025 Compare Cities People:
Portola Valley, CA vs Atherton, CA

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Highlights
- Atherton is 0% more densely populated than Portola Valley.
- People are 8.4% less likely to be married in Atherton.
- The Median Age is 7.7 years younger in Atherton.
 Portola Valley, CAAtherton, CAUnited States
 Population  Unlock7,181329,725,481
 Female Population56.0%  Unlock50.5%
 Male Population44.0%  Unlock49.5%
 Median Age  Unlock47.938.4
 space3
 Population - 20104,367  Unlock309,327,143
 Population - 2000  Unlock7,194285,036,114
 Population - 19904,194  Unlock251,960,433
 Pop. 2000 to Now  Unlock-2.5%15.6%
 Pop. 1990 to Now8.0%  Unlock30.8%
 space4
 Population Density  Unlock1,427.693.4
 Land Area9.1  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Portola Valley, CAAtherton, CAUnited States
 Age 0 to 45.3%  Unlock5.9%
 Age 5 to 9  Unlock3.3%6.1%
 Age 10 to 145.0%  Unlock6.6%
 Age 15 to 17  Unlock5.9%3.9%
 Age 18 to 202.7%  Unlock4.0%
 Age 21 to 24  Unlock4.5%5.2%
 Age 25 to 340.9%  Unlock13.8%
 Age 35 to 44  Unlock6.8%12.9%
 Age 45 to 5413.6%  Unlock12.6%
 Age 55 to 59  Unlock7.9%6.7%
 Age 60 to 646.4%  Unlock6.3%
 Age 65 to 74  Unlock12.6%9.6%
 Age 75 to 8411.0%  Unlock4.5%
 Age 85 and over  Unlock4.5%1.9%
 space1
 Race
 Portola Valley, CAAtherton, CAUnited States
 White75.6%  Unlock59.4%
 Black  Unlock1.2%12.2%
 Asian6.4%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.0%  Unlock0.2%
 Other  Unlock0.0%0.4%
 Two or More Races4.8%  Unlock3.2%
 Hispanic  Unlock8.8%18.4%
 space2
 Marriage & Family
 Portola Valley, CAAtherton, CAUnited States
 Married Population64.3%  Unlock49.8%
     Currently Married  Unlock58.3%48.0%
 Married but Separated0.3%  Unlock1.8%
 Single Population  Unlock41.1%50.2%
 Never Married17.1%  Unlock33.8%
 Divorced  Unlock3.4%10.8%
 Widowed8.0%  Unlock5.6%
 space5
 Household Size  Unlock2.922.60
 Households1,662  Unlock124,010,992
 Family Households  Unlock1,84380,755,759
     Married couple, w/children27.9%  Unlock30.5%
     Married couple, no children  Unlock55.9%42.9%
 Non Family Households482  Unlock43,255,233
     Single householder, w/children  Unlock5.1%15.8%
     Single householder, no children0.0%  Unlock10.8%
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Learn More About Portola Valley, California
Overview
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Learn More About Atherton, California
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