Walnut, CA ZIP Codes & Directory
Walnut is located in Los Angeles County in California. Browse all active 5-digit USPS ZIP codes serving Walnut and surrounding Los Angeles County delivery districts.
All ZIP Codes in Walnut, CA
1 CodesAbout Walnut Mail Delivery & Postal Administration
ZIP codes in Walnut are administered by the United States Postal Service. Delivery routes are coordinated through regional Sectional Center Facilities (SCFs) servicing Los Angeles County and surrounding California metropolitan districts.
Frequently Asked Questions About Walnut, CA ZIP Codes
How many ZIP codes serve Walnut, California? ▾
Walnut, California is served by 1 active USPS postal delivery codes: 91789.
What county is Walnut located in? ▾
Walnut is an incorporated city located within Los Angeles County, California.
What is the population and demographic size of Walnut? ▾
According to official U.S. Census Bureau data, Walnut has an estimated population of 41,235 residents and is situated within the undefined.
How does mail sorting and delivery work in Walnut? ▾
Mail delivery in Walnut is operated by the United States Postal Service (USPS) through regional Sectional Center Facility (SCF) distribution plants servicing Los Angeles County and surrounding California counties.
How much does it cost to ship a package to Walnut, CA? ▾
Shipping costs to Walnut depend on the package weight, dimensions, shipping carrier (USPS, UPS, FedEx), and the distance from the origin ZIP code. To calculate exact postage rates, use our shipping cost estimator tool.
What is the standard delivery time for mail to Walnut? ▾
Standard USPS Ground Advantage typically takes 2-5 business days to reach Walnut, depending on the origin. Priority Mail generally arrives in 1-3 business days. Please check tracking for specific regional routing times.