Walnut, CA ZIP Codes
One ZIP code serves Walnut, California: 91789. Together they are home to 40,298 residents in 12,681 households. That is more than the 27,611 people counted inside Walnut city limits, because these ZIP codes reach past its boundary.
Walnut city limits (Census)
| Measure | Census figure |
|---|---|
| Residents | 27,611 |
| Households | 8,665 |
| Median household income | $129,449 |
| Median home value | $1,014,000 |
| Median age | 46.8 |
| Median rent | $3,202 |
All 1 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 40,298 |
| Households (sum of ZIP codes) | 12,681 |
| Median household income, range across ZIP codes | $125,720 (91789) to $125,720 (91789) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $125,720 |
| Homeowners | 82.1% |
| Households with kids under 18 | 31.8% |
| Moved in the past year | 8.7% |
| Carrier routes in EDDM2GO's route library | 31 routes, 13,516 homes (1 of 1 ZIP codes) |
Every ZIP code in Walnut
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 91789 | Walnut | 40,298 | 12,681 | $125,720 | $975,000 | 82.1% | 31.8% | 8.7% | 31 | 15,309 | 56% of its land; mailing city |
A ZIP code is listed for Walnut when at least 10% of its land lies inside Walnut city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Walnut. The table shows which applies. Totals add up whole ZIP codes, so they include any parts outside Walnut.
Counties
- Los Angeles County — 298 ZIP codes
Nearby cities sharing these ZIP codes
- Diamond Bar — 2 ZIP codes
- Rowland Heights — 2 ZIP codes
Price a mailing to Walnut ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Walnut, CA?
- 91789. A ZIP code is listed for Walnut when at least 10% of its land lies inside Walnut city limits, when it holds at least 10% of the place's land, or when its USPS mailing city is Walnut.
- What is the population of Walnut, CA?
- The Census Bureau counts 27,611 residents inside Walnut city limits (ACS 2020–2024). The 1 ZIP code that serve Walnut hold 40,298 residents in all.
- What is the median household income in Walnut, CA?
- $129,449 inside Walnut city limits, per the Census Bureau. Across its ZIP codes the medians run from $125,720 to $125,720.
- How many carrier routes and mailboxes are in Walnut, CA?
- For the 1 of 1 ZIP codes in EDDM2GO's stored route library: 31 carrier routes reaching 13,516 residential and 1,791 business mailboxes.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.