California · United States
Diamond Bar population
56,897people · latest figure
Diamond Bar has a population of 56,897, making it the 740th largest place we list in United States. It is in California.
Diamond Bar holds under a tenth of one per cent of United States's 349,035,494 people. New York City, the largest place we list there, is 155 times its size. Twenty years earlier the World Gazetteer recorded 58,935, a fall of 3%.
The 2005 figure comes from the World Gazetteer archive restored on this site. The two sources may draw the settlement's boundary differently, so treat the change as indicative rather than exact. Why figures differ.
Diamond Bar is in California, which has 1,132 recorded places.
Nearby in size
| Place | Region | Population |
|---|---|---|
| New Brunswick | New Jersey | 57,035 |
| Grand Forks | North Dakota | 57,011 |
| Fountain Valley | California | 56,987 |
| Taunton | Massachusetts | 56,789 |
| Oak Lawn | Illinois | 56,781 |
| Union | New Jersey | 56,771 |
All places in United States → · California →
Figures are the latest available in GeoNames (CC BY 4.0), which draws on national censuses of varying dates — treat them as recent, not same-year. Country totals are UN World Population Prospects 2024 (medium variant) where the UN lists the country separately; the handful it reports under a parent state keep a GeoNames figure and are marked as such. Sources & method.