ZIP code · Diamond Bar · California · United States
ZIP code 91765 — Diamond Bar
ZIP code 91765 serves Diamond Bar, California.
- Postal code
- 91765Single source Value from one source, not cross-checked.
- City
- Diamond Bar
- County
- Los Angeles FIPS 06037
- State
- California
- Country
- United States
- Coordinates
- 34.0066, -117.8098 — precision precise (locality)
View on OpenStreetMap - Population
- 44,779 (ZCTA, ACS 5-year)
- Population density
- 2,411 / sq mi
- Land area
- 18.6 sq mi (48.1 km²) (ZCTA, ACS 5-year)
- Median household income
- $104,737
- Per-capita income
- $48,821
- Median age
- 45.7
- Households
- 15,420
- Housing units
- 16,056
- Median home value
- $878,900
- Median gross rent
- $2,395 / month
- Congressional district
- CA-38 (119th Congress)
- USDA hardiness zone
- 10a (30 to 35 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Los_Angeles (UTC−8 / UTC−7 DST)
Tools: compare 91765 with another ZIP · ZIPs within 25 miles · distance from 91765
Map of ZIP code 91765
Climate — monthly normals
Warmest month Aug (avg high 92°F), coldest Dec (avg low 42°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 68 | 67 | 72 | 76 | 78 | 84 | 90 | 92 | 89 | 81 | 74 | 67 |
| Avg low °F | 43 | 45 | 47 | 50 | 54 | 57 | 62 | 63 | 60 | 54 | 47 | 42 |
| Precip in | 2.9 | 4.2 | 2.1 | 1.0 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 | 1.0 | 0.7 | 2.3 |
NOAA 1991–2020 climate normals from the nearest station: POMONA/FAIRPLEX (5.8 mi) · NOAA NCEI
Places in ZIP 91765
- 16 schools
- 3 hospitals & clinics
- 6 doctors & dentists
- 1 pharmacies
- 5 supermarkets
- 64 restaurants & cafés
- 11 parks
- 36 playgrounds
- 4 gyms & sports centres
- 1 libraries
- 2 post offices
- 9 places of worship
- 14 banks
- 9 gas stations
- 4 EV charging stations
- 2 police & fire stations
Places mapped inside this ZIP’s ZCTA area in OpenStreetMap. OSM is community-maintained: counts reflect what has been mapped, and completeness varies by area — treat them as at-least figures. © OpenStreetMap contributors (ODbL) · Methodology
About this page
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Data generated on 2026-08-21. Methodology · Report an error on this page