The 738 area code covers the same area as 323, including Los Angeles and Montebello in California.
738 has been in service since 2024, on Pacific Time. 213 and 323 cover the same area, so two neighbours can have different area codes.
- Where
- Los Angeles County, California
- Time zone
- Pacific Time
- In service since
- 2024
- Shares its area with
- 213 (since 1947) and 323 (since 1998)
- Prefixes in use
- 26
- How to dial
- Local calls need 1, then the area code, then the number: 1-738-555-0142.
Find out who called you from a 738 number.
Enter the full 10-digit number to see who it is listed to, where it is registered, and whether it is a mobile, landline or VoIP line.
Los Angeles holds 92% of the phone prefixes in area code 738.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 26 prefixes in use shows where 738 numbers are actually given out.
- Los Angeles24 prefixes, 92%
- Montebello2 prefixes, 8%
738 started in 2024 as an overlay on 323, and its ground has not changed since.
2024
738 starts as an overlay on 323: new numbers on the same ground.
A 738 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
California has 40 other area codes.
These are the questions people ask most about area code 738.
Where is area code 738?
738 covers Los Angeles and Montebello in California, in Los Angeles County.
What time zone is area code 738 in?
738 is on Pacific Time.
Is 738 the same area as 213 and 323?
Yes. 213 (since 1947) and 323 (since 1998) cover the same ground as 738. Nobody's number changed when they were added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 738 number?
Local calls need 1, then the area code, then the number: 1-738-555-0142.
Who called me from a 738 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 738 a scam?
738 is a real California area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.