Diamond Bar California ZIP Codes
Diamond Bar holds a single ZIP code.
Every ZIP code in Diamond Bar
| ZIP code | County |
|---|---|
| 91765 | Los Angeles County |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Diamond Bar codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Diamond Bar. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Diamond Bar ZIP code begins 917. Those first three digits identify the sectional center facility that processes mail for this part of California. Statewide that range covers 64 ZIP codes, so Diamond Bar accounts for 2% of it.
Every California ZIP prefix and the region it covers →
Area codes covering Diamond Bar
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Diamond Bar occupies.
Diamond Bar California area codes in full →
Where Diamond Bar's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Diamond Bar
| City | Distance | ZIP codes |
|---|---|---|
| Walnut California ZIP codes | 3.3 mi | 2 ZIP codes |
| Pomona California ZIP codes | 5.1 mi | 4 ZIP codes |
| Brea California ZIP codes | 5.9 mi | 3 ZIP codes |
| West Covina California ZIP codes | 6.5 mi | 4 ZIP codes |
| Chino Hills California ZIP codes | 6.6 mi | 1 ZIP code |
| Covina California ZIP codes | 7.2 mi | 3 ZIP codes |
| San Dimas California ZIP codes | 7.4 mi | 1 ZIP code |
| La Puente California ZIP codes | 8.1 mi | 4 ZIP codes |
Straight-line distance between place reference points, not driving distance.