2025 Compare Cities People:
Diamond Bar, CA vs San Mateo, CA

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Highlights
- San Mateo is 0% more densely populated than Diamond Bar.
- People are 9.1% less likely to be married in San Mateo.
- The Median Age is 6.0 years younger in San Mateo.
 Diamond Bar, CASan Mateo, CAUnited States
 Population  Unlock105,087329,725,481
 Female Population51.7%  Unlock50.5%
 Male Population48.3%  Unlock49.5%
 Median Age  Unlock37.738.4
 space3
 Population - 201055,559  Unlock309,327,143
 Population - 2000  Unlock92,482285,036,114
 Population - 199053,672  Unlock251,960,433
 Pop. 2000 to Now  Unlock10.7%15.6%
 Pop. 1990 to Now2.3%  Unlock30.8%
 space4
 Population Density  Unlock8,632.893.4
 Land Area14.9  Unlock3,531,905.4
 Water Area  Unlock3.7264,836.8
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 Est. Total Population By Age
 Diamond Bar, CASan Mateo, CAUnited States
 Age 0 to 45.3%  Unlock5.9%
 Age 5 to 9  Unlock5.6%6.1%
 Age 10 to 146.2%  Unlock6.6%
 Age 15 to 17  Unlock2.7%3.9%
 Age 18 to 202.8%  Unlock4.0%
 Age 21 to 24  Unlock4.1%5.2%
 Age 25 to 3412.1%  Unlock13.8%
 Age 35 to 44  Unlock15.4%12.9%
 Age 45 to 5414.6%  Unlock12.6%
 Age 55 to 59  Unlock5.8%6.7%
 Age 60 to 647.2%  Unlock6.3%
 Age 65 to 74  Unlock8.0%9.6%
 Age 75 to 844.0%  Unlock4.5%
 Age 85 and over  Unlock2.8%1.9%
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 Race
 Diamond Bar, CASan Mateo, CAUnited States
 White14.1%  Unlock59.4%
 Black  Unlock1.9%12.2%
 Asian60.7%  Unlock5.6%
 Native American  Unlock0.1%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock0.6%0.4%
 Two or More Races2.7%  Unlock3.2%
 Hispanic  Unlock24.1%18.4%
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 Marriage & Family
 Diamond Bar, CASan Mateo, CAUnited States
 Married Population57.8%  Unlock49.8%
     Currently Married  Unlock51.3%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock47.4%50.2%
 Never Married29.5%  Unlock33.8%
 Divorced  Unlock8.9%10.8%
 Widowed5.1%  Unlock5.6%
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 Household Size  Unlock2.582.60
 Households17,788  Unlock124,010,992
 Family Households  Unlock25,42080,755,759
     Married couple, w/children32.0%  Unlock30.5%
     Married couple, no children  Unlock43.3%42.9%
 Non Family Households3,342  Unlock43,255,233
     Single householder, w/children  Unlock10.4%15.8%
     Single householder, no children12.2%  Unlock10.8%
Reviews for Diamond Bar    3 Reviews

Over 14 years ago

Beautiful city and great place to raise a family. The worst part of Diamond Bar would be some of the best places to live in other cities. Diamond Bar has some of the  More

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Over 14 years ago

The city is centrally located to riverside, San Bernardino, Orange County and Downtown La. It is very scenic with beautiful hills, great schools and within easy reach,  More

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Over 15 years ago

This is a very quiet area about 30 mile east of downtown Los Angeles. I'm a bit concerned about what effect a possible new NFL stadium in the City of Industry CA will  More

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Reviews for San Mateo    12 Reviews

I have lived in San Mateo since 2013. It has seen tremendous growth, lots of new restaurants which have become progressively more high-end though there is ample  More

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I'm a native of California. I have lived in the southern part of the state and the northern part of the state for most of my life. I have spent the last 29 years in  More

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Over 15 years ago

San Mateo has a diverse mix of people, a pleasant climate, a very pleasant downtown park with lots going on, and pretty much whatever you need handy. It's not far to  More

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