Area codes in Montebello, California
Montebello, California uses 2 area codes — 323 and 738. The main Montebello area code is 323.
Area codes serving Montebello
Phone numbers in Montebello are written as ten digits — for example (323) 555-0190 — and fall in the Pacific Time zone.
How Montebello came to have 2 area codes
The original Montebello area code is 323, in service since 1998. As the area ran low on available numbers, an overlay code was added over the same region for new phone lines: 738 (2024). Existing numbers kept their original code — an overlay never forces anyone to change their number — which is why Montebello now uses all 2 codes and every local call is dialed with ten digits.
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Frequently asked questions
What is the area code for Montebello?
The main area code for Montebello, California is 323. Montebello is now served by 2 area codes in total: 323, 738.
How many area codes does Montebello have?
Montebello has 2 area codes: 323, 738.
Why does Montebello have more than one area code?
As Montebello used up the numbers available in its original area code (323, in service since 1998), additional "overlay" codes were added over the same area so new phone numbers could keep being assigned.
How do you dial a Montebello number?
Dial all 10 digits — the area code (323 or 738) 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.