Pick 909 if the number should read as Ontario.
The numbering administrator names Ontario first among the places 909 serves.
The area codes for Ontario, California are 909 and 840.
Area codes in Ontario, California
Get a phone number with the right area code for Ontario, California.
Ontario is on the western edge of San Bernardino County and uses 909 and 840. Pomona and Claremont, in Los Angeles County, use the same codes.
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Ontario, California has two area codes.
- 909Since 1992Ontario, Fontana and PomonaRancho CucamongaChinoChino Hills
93 FCC complaints
Get a 909 number - 840Since 2021Overlay code
18 FCC complaints
Pick 909 for Ontario, which has covered the city since 1992.
Pick 909 to reach both sides of the county line.
Claremont, Pomona, Diamond Bar and Walnut are in Los Angeles County, and they share the code with Ontario.
Pick 626 if the number is for Covina or Glendora.
626 serves the San Gabriel Valley, just west of the 909 area.
People filed 111 FCC complaints about unwanted calls from Ontario, California area codes in 12 months.
From October 2025 to September 2026, 111 unwanted-call complaints filed with the FCC gave a caller ID number that started with 909 and 840. 909 was named most, on 93 of them (84%).
- 111unwanted-call complaints named a Ontario, California code
- 909was named on the most of them, 93
- 84%of the Ontario, California complaints named 909
Ontario, California codes
How many complaints named a caller ID that starts with each Ontario, California code.
- 1909Ontario, Fontana and Pomona93
- 2840Overlay code18
Source: Federal Communications Commission, CGB - Consumer Complaints Data (dataset 3xyp-aqkj), issue "Unwanted Calls", read on November 4, 2026. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
This is how you get a Ontario, California number.
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Type the code you picked.
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People ask these questions about Ontario, California area codes.
More in the full FAQ.
No. Ontario is in San Bernardino County, though 909 also covers Pomona on the Los Angeles side.
It was split in two, and the southern part became 951. Ontario stayed in 909.
A local call in Ontario, California is dialed with 1 plus ten digits, whichever of its codes the number starts with. The area code is part of every number you give out.
From October 2025 to September 2026, people filed 111 FCC complaints about unwanted calls from numbers that start with a Ontario, California code: 909 (93) and 840 (18). A complaint is one person's report. Caller ID can be faked, so a code shows what appeared on the phone, not where the caller was.
Yes. You type the area code you want when you create a number, and you do not need to live in Ontario, California. Calls ring the phone you already have, and texts land in your ExpressNumber inbox.
No. Your numbers are receive-only: they take calls and texts, and they never make them. You answer calls on your own phone, and you cannot reply to a text from the inbox.
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Codes around Ontario, California
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Every fact on this page comes from public numbering records.
The codes, the places and the years are rows of the North American Numbering Plan Administrator's area code database, and the complaints are the FCC's own.
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