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2026 Compare Cities People:
Diamond Bar, CA vs Montclair, CA

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Highlights
- Montclair is 0% more densely populated than Diamond Bar.
- People are 25.4% less likely to be married in Montclair.
- The Median Age is 11.2 years younger in Montclair.
 Diamond Bar, CAMontclair, CAUnited States
 Population  Unlock37,871329,725,481
 Female Population51.7%  Unlock50.5%
 Male Population48.3%  Unlock49.5%
 Median Age  Unlock32.538.4
 space3
 Population - 201055,559  Unlock309,327,143
 Population - 2000  Unlock33,049285,036,114
 Population - 199053,672  Unlock251,960,433
 Pop. 2000 to Now  Unlock22.9%15.6%
 Pop. 1990 to Now2.3%  Unlock30.8%
 space4
 Population Density  Unlock6,866.993.4
 Land Area14.9  Unlock3,531,905.4
 Water Area  Unlock0.0264,836.8
 space
 Est. Total Population By Age
 Diamond Bar, CAMontclair, CAUnited States
 Age 0 to 45.3%  Unlock5.9%
 Age 5 to 9  Unlock7.0%6.1%
 Age 10 to 146.2%  Unlock6.6%
 Age 15 to 17  Unlock5.5%3.9%
 Age 18 to 202.8%  Unlock4.0%
 Age 21 to 24  Unlock7.4%5.2%
 Age 25 to 3412.1%  Unlock13.8%
 Age 35 to 44  Unlock12.5%12.9%
 Age 45 to 5414.6%  Unlock12.6%
 Age 55 to 59  Unlock5.4%6.7%
 Age 60 to 647.2%  Unlock6.3%
 Age 65 to 74  Unlock5.8%9.6%
 Age 75 to 844.0%  Unlock4.5%
 Age 85 and over  Unlock1.3%1.9%
 space1
 Race
 Diamond Bar, CAMontclair, CAUnited States
 White14.1%  Unlock59.4%
 Black  Unlock4.3%12.2%
 Asian60.7%  Unlock5.6%
 Native American  Unlock0.3%0.6%
 Hawaiian, Pacific Islander0.2%  Unlock0.2%
 Other  Unlock0.2%0.4%
 Two or More Races2.7%  Unlock3.2%
 Hispanic  Unlock72.3%18.4%
 space2
 Marriage & Family
 Diamond Bar, CAMontclair, CAUnited States
 Married Population57.8%  Unlock49.8%
     Currently Married  Unlock40.7%48.0%
 Married but Separated0.7%  Unlock1.8%
 Single Population  Unlock56.9%50.2%
 Never Married29.5%  Unlock33.8%
 Divorced  Unlock8.2%10.8%
 Widowed5.1%  Unlock5.6%
 space5
 Household Size  Unlock3.792.60
 Households17,788  Unlock124,010,992
 Family Households  Unlock8,14880,755,759
     Married couple, w/children32.0%  Unlock30.5%
     Married couple, no children  Unlock27.4%42.9%
 Non Family Households3,342  Unlock43,255,233
     Single householder, w/children  Unlock24.5%15.8%
     Single householder, no children12.2%  Unlock10.8%
Voting
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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Reviews for Montclair    2 Reviews
Mike · Montclair, CA
Montclair is a great place to live
Over 5 years ago

One of the best cities I have lived in. Great city to invest in now because the city has future development plans that will raise property value higher.  More

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Ray · Montclair, CA
Montclair don't count it out!
Over 6 years ago

Pros Freeway access City has a train stop Shopping is convenient Not so much city traffic Beautiful View Close access to nature (Close drive to desert, beach,  More

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Learn More About Diamond Bar, California
Overview
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