Diamond Bar, CA ZIP Codes
2 ZIP codes serve Diamond Bar, California: 91765 and 91789. Together they are home to 84,800 residents in 27,914 households. That is more than the 53,355 people counted inside Diamond Bar city limits, because these ZIP codes reach past its boundary. Median household income ranges from $105,565 in 91765 to $125,720 in 91789.
Diamond Bar city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 53,355 |
| Households | 18,005 |
| Median household income | $108,281 |
| Median home value | $902,200 |
| Median age | 45.7 |
| Median rent | $2,521 |
All 2 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 84,800 |
| Households (sum of ZIP codes) | 27,914 |
| Median household income, range across ZIP codes | $105,565 (91765) to $125,720 (91789) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $114,721 |
| Homeowners | 79.6% |
| Households with kids under 18 | 31.5% |
| Moved in the past year | 7.7% |
| Carrier routes in EDDM2GO's route library | 60 routes, 29,361 homes (2 of 2 ZIP codes) |
Top facts
- Highest median household income in Diamond Bar: 91789 ($125,720)
- Most residents: 91765 (44,502 people)
- Highest homeownership: 91789 (82.1% own their home)
- Most households with kids: 91789 (31.8% of households)
- Most new movers: 91789 (8.7% moved in last year)
- Youngest median age: 91765 (46.0 years)
- Highest median home value: 91789 ($975,000)
Every ZIP code in Diamond Bar
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 91765 | Diamond Bar | 44,502 | 15,233 | $105,565 | $915,100 | 77.5% | 31.2% | 6.8% | 29 | 16,885 | 70% of its land; mailing city |
| 91789 | Walnut | 40,298 | 12,681 | $125,720 | $975,000 | 82.1% | 31.8% | 8.7% | 31 | 15,309 | 12% of its land |
A ZIP code is listed for Diamond Bar when at least 10% of its land lies inside Diamond Bar city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Diamond Bar. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Diamond Bar.
Counties
- Los Angeles County — 298 ZIP codes
Nearby cities sharing these ZIP codes
- Rowland Heights — 2 ZIP codes
- Walnut — 1 ZIP code
Price a mailing to Diamond Bar ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Diamond Bar, CA?
- 91765 and 91789. A ZIP code is listed for Diamond Bar when at least 10% of its land lies inside Diamond Bar city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Diamond Bar.
- What is the population of Diamond Bar, CA?
- The Census Bureau counts 53,355 residents inside Diamond Bar city limits (ACS 2020–2024). The 2 ZIP codes that serve Diamond Bar hold 84,800 residents in all.
- What is the median household income in Diamond Bar, CA?
- $108,281 inside Diamond Bar city limits, per the Census Bureau. Across its ZIP codes the medians run from $105,565 to $125,720.
- Which Diamond Bar ZIP code has the highest median household income?
- 91789, at $125,720, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Diamond Bar, CA?
- For the 2 of 2 ZIP codes in EDDM2GO's stored route library: 60 carrier routes reaching 29,361 residential and 2,827 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.