Ontario, CA ZIP Codes & Directory
Ontario is located in San Bernardino County in California. Browse all active 5-digit USPS ZIP codes serving Ontario and surrounding San Bernardino County delivery districts.
All ZIP Codes in Ontario, CA
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About Ontario Mail Delivery & Postal Administration
ZIP codes in Ontario are administered by the United States Postal Service. Delivery routes are coordinated through regional Sectional Center Facilities (SCFs) servicing San Bernardino County and surrounding California metropolitan districts.
Frequently Asked Questions About Ontario, CA ZIP Codes
How many ZIP codes serve Ontario, California? ▾
Ontario, California is served by 4 active USPS postal delivery codes: 91758, 91761, 91762, 91764.
What county is Ontario located in? ▾
Ontario is an incorporated city located within San Bernardino County, California.
What is the population and demographic size of Ontario? ▾
According to official U.S. Census Bureau data, Ontario has an estimated population of 178,152 residents and is situated within the undefined.
How does mail sorting and delivery work in Ontario? ▾
Mail delivery in Ontario is operated by the United States Postal Service (USPS) through regional Sectional Center Facility (SCF) distribution plants servicing San Bernardino County and surrounding California counties.
How much does it cost to ship a package to Ontario, CA? ▾
Shipping costs to Ontario 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 Ontario? ▾
Standard USPS Ground Advantage typically takes 2-5 business days to reach Ontario, depending on the origin. Priority Mail generally arrives in 1-3 business days. Please check tracking for specific regional routing times.