Walnut Creek, CA ZIP Codes & Directory
Walnut Creek is located in Contra Costa County in California. Browse all active 5-digit USPS ZIP codes serving Walnut Creek and surrounding Contra Costa County delivery districts.
All ZIP Codes in Walnut Creek, CA
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About Walnut Creek Mail Delivery & Postal Administration
ZIP codes in Walnut Creek are administered by the United States Postal Service. Delivery routes are coordinated through regional Sectional Center Facilities (SCFs) servicing Contra Costa County and surrounding California metropolitan districts.
Frequently Asked Questions About Walnut Creek, CA ZIP Codes
How many ZIP codes serve Walnut Creek, California? ▾
Walnut Creek, California is served by 4 active USPS postal delivery codes: 94595, 94596, 94597, 94598.
What county is Walnut Creek located in? ▾
Walnut Creek is an incorporated city located within Contra Costa County, California.
What is the population and demographic size of Walnut Creek? ▾
According to official U.S. Census Bureau data, Walnut Creek has an estimated population of 91,064 residents and is situated within the undefined.
How does mail sorting and delivery work in Walnut Creek? ▾
Mail delivery in Walnut Creek is operated by the United States Postal Service (USPS) through regional Sectional Center Facility (SCF) distribution plants servicing Contra Costa County and surrounding California counties.
How much does it cost to ship a package to Walnut Creek, CA? ▾
Shipping costs to Walnut Creek 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 Creek? ▾
Standard USPS Ground Advantage typically takes 2-5 business days to reach Walnut Creek, depending on the origin. Priority Mail generally arrives in 1-3 business days. Please check tracking for specific regional routing times.