Area codes in Chino, California
Chino, California uses 2 area codes — 909 and 840. The main Chino area code is 909.
Area codes serving Chino
Phone numbers in Chino are written as ten digits — for example (909) 555-0190 — and fall in the Pacific Time zone.
How Chino came to have 2 area codes
The original Chino area code is 909, in service since 1992. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 840 (2021). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Chino now uses all 2 codes and every local call is dialed with ten digits.
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Nearby cities
- Chino Hills area codes
- Pomona area codes
- Montclair area codes
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More cities in California
- Los Angeles area codes
- San Diego area codes
- San Francisco area codes
- Sacramento area codes
- San Jose area codes
- Fresno area codes
- Long Beach area codes
- Oakland area codes
Frequently asked questions
What is the area code for Chino?
The main area code for Chino, California is 909. Chino is now served by 2 area codes in total: 909, 840.
How many area codes does Chino have?
Chino has 2 area codes: 909, 840.
Why does Chino have more than one area code?
As Chino used up the numbers available in its original area code (909, in service since 1992), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Chino number?
Dial all 10 digits — the area code (909 or 840) followed by the 7-digit local number. From abroad, dial +1, then the area code and number.
Sourced from the official NANPA (North American Numbering Plan Administrator) numbering database, current as of August 2, 2026. Refreshed monthly.