ZIP Code 91789

ZIP code 91789 is classified by USPS as a standard delivery area and covers roughly 40.5 square miles in Walnut, Los Angeles County, California. The area is home to 43,079 residents, producing a population density of 1,064 people per square mile, and falls within the Los Angeles time zone. These USPS and Census boundary values drive every downstream statistic on this page, including the benchmarks that compare 91789 against California and the nation.

On the economic side, the median household income for ZIP 91789 sits at $125,720 (24% above the California average), while per-capita income is $49,392. The poverty rate stands at 9.2% and the unemployment rate at 4.4%. On housing, the median home value is $975,000 (26% above the state average) with median rent at $2,865 per month, and 82.1% of occupied units are owner-occupied, a direct signal of whether 91789 behaves more like a homeowner neighborhood or a renter-heavy ZIP.

Education and household profile round out the picture: 54.4% of adults hold a bachelor's degree or higher, the median age is 46.3, and the average commute is 34 minutes. We also surface 10 nearby ZIP codes within roughly 10 miles and 6 additional ZIPs sharing Los Angeles County, so you can benchmark 91789 against its immediate geography rather than a national average alone. Every figure is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates, HUD Fair Market Rents, and FHFA Home Price Index data, no estimates, no proprietary scoring. Verify with HUD →