Diamond Bar, California Zip Codes
📍 Diamond Bar is in Los Angeles County, California with 1 zip code; the most populous is 91765.
Diamond Bar is a USPS city name in Los Angeles County, California with a Census population of approximately 45,303 across its ZIP codes. Los Angeles County as a whole has 538 ZIP codes in this directory. Below you'll find every zip code serving Diamond Bar with population, income and home value, a map, and the city's affordability profile.
Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).
All Diamond Bar Zip Codes
Diamond Bar at a Glance
Diamond Bar has 1 ZIP code in this directory: 1 standard delivery ZIP. The 1 ZIP with published Census housing data cover 45,303 residents, the largest being 91765 with 45,303 people.
The median ZIP in Diamond Bar has a household income of $105,712 and a home value of $839,700, a price-to-income ratio of 7.9, above the 6.7 California ZIP median. Median rent across these ZIPs is $2,310 a month.
77% of households in the typical Diamond Bar ZIP own their home (statewide ZIP median 64%). 52% of adults hold a bachelor's degree, far above the 31% statewide median. The median poverty rate is 9.7%, below the 10.8% statewide ZIP median. Overall density is about 2,436 residents per square mile across 19 square miles of ZIP land area.
Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 California ZIP Code Affordability Report.
Diamond Bar Zip Code Map
Interactive map of Diamond Bar, California zip codes. Click any marker for details.