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2026 Compare Cities People:
San Marino, CA vs Diamond Bar, CA

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Highlights
- Diamond Bar is 0% more densely populated than San Marino.
- People are 12.3% less likely to be married in Diamond Bar.
- The Median Age is 1.9 years younger in Diamond Bar.
 San Marino, CADiamond Bar, CAUnited States
 Population  Unlock55,339329,725,481
 Female Population48.6%  Unlock50.5%
 Male Population51.4%  Unlock49.5%
 Median Age  Unlock43.738.4
 space3
 Population - 201013,102  Unlock309,327,143
 Population - 2000  Unlock56,287285,036,114
 Population - 199012,959  Unlock251,960,433
 Pop. 2000 to Now  Unlock-2.5%15.6%
 Pop. 1990 to Now-1.3%  Unlock30.8%
 space4
 Population Density  Unlock3,721.593.4
 Land Area3.8  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 San Marino, CADiamond Bar, CAUnited States
 Age 0 to 45.4%  Unlock5.9%
 Age 5 to 9  Unlock5.4%6.1%
 Age 10 to 145.7%  Unlock6.6%
 Age 15 to 17  Unlock3.4%3.9%
 Age 18 to 202.2%  Unlock4.0%
 Age 21 to 24  Unlock4.1%5.2%
 Age 25 to 3410.4%  Unlock13.8%
 Age 35 to 44  Unlock12.4%12.9%
 Age 45 to 5415.8%  Unlock12.6%
 Age 55 to 59  Unlock8.2%6.7%
 Age 60 to 648.0%  Unlock6.3%
 Age 65 to 74  Unlock12.6%9.6%
 Age 75 to 844.9%  Unlock4.5%
 Age 85 and over  Unlock1.8%1.9%
 space1
 Race
 San Marino, CADiamond Bar, CAUnited States
 White23.7%  Unlock59.4%
 Black  Unlock4.0%12.2%
 Asian66.5%  Unlock5.6%
 Native American  Unlock0.2%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock0.4%0.4%
 Two or More Races2.3%  Unlock3.2%
 Hispanic  Unlock17.8%18.4%
 space2
 Marriage & Family
 San Marino, CADiamond Bar, CAUnited States
 Married Population65.9%  Unlock49.8%
     Currently Married  Unlock57.2%48.0%
 Married but Separated0.1%  Unlock1.8%
 Single Population  Unlock42.2%50.2%
 Never Married25.6%  Unlock33.8%
 Divorced  Unlock7.6%10.8%
 Widowed5.6%  Unlock5.6%
 space5
 Household Size  Unlock3.102.60
 Households3,942  Unlock124,010,992
 Family Households  Unlock14,44680,755,759
     Married couple, w/children35.7%  Unlock30.5%
     Married couple, no children  Unlock47.1%42.9%
 Non Family Households513  Unlock43,255,233
     Single householder, w/children  Unlock8.7%15.8%
     Single householder, no children10.6%  Unlock10.8%
Voting
Reviews for San Marino    2 Reviews
jane · San Marino, CA
Democrates 63%???
Over 16 years ago

I can't believe that the voters in this city -- always highly REPUBLICAN--are composed of 63% Democrats and in the 30s for republicans. I am a Democrat but was  More

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Stef · Norco, CA
Nice Growing Up There
Over 19 years ago

Our family lived right on the border of San Marino in the 50's and 60's. We went to the fine schools there and enjoyed a wonderful education. There were only 2  More

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Reviews for Diamond Bar    3 Reviews
EG · Brea, CA
Diamond Bar is beautiful
Over 15 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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EG · Brea, CA
Diamond Bar is beautiful
Over 15 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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RICHARD · Walnut, CA
NFL
Over 16 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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Learn More About San Marino, California
Overview
Cost of Living
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Crime
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Learn More About Diamond Bar, California
Overview
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