Diamond Bar, California

1 ZIP code · Pacific time

ZIP codes (largest first)

91765 · 44,502
Population53,355
StateCalifornia
CountyLos Angeles County
Time zonePacific
Land area14.88 sq mi

Area codes in this area

840909

These are the area codes that most often serve Diamond Bar (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.

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Population: U.S. Census Bureau, ACS 5-year estimates, 2024.