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Ontario ZIP codes

4 ZIP codes in Ontario, California, United States, from 91758 to 91764.

ZIP codes
4, 91758–91764
Format
NNNNN NNNNN-NNNN

All ZIP codes in Ontario

How to write an address in Ontario

John Smith
Company Name
123 Main Street
ONTARIO, CALIFORNIA 91758
UNITED STATES

The ZIP code goes after the city, on the same line. Ontario uses the United States format NNNNN NNNNN-NNNN. See the United States address guide.

Cities near Ontario

Questions about Ontario postal codes

What is the ZIP code of Ontario?

Ontario doesn't have a single ZIP code. It has 4 of them, from 91758 to 91764, and each street or district has its own. Click the map above to find the code for an exact address.

How do I write an address in Ontario?

Use this order, one part per line: John Smith / Company Name / 123 Main Street / ONTARIO, CALIFORNIA 91758. The ZIP code goes after the city, on the same line.