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The 738 area code covers the same area as 323, including Los Angeles and Montebello in California.

Area code 738 is in California, on Pacific Time. In the 738 area, phone numbers are given out in Los Angeles County. It has been in service since November 1, 2024. 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
November 1, 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, the city and state on the listing, and whether it is a mobile, landline or VoIP line. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup.

Works for US & Canada numbers. Enter a 10-digit number, e.g. (415) 555-0132.

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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%
One dot per US area code; 738 is the ringed one.

Each prefix, or block of 1,000 numbers inside it, is also handed to a carrier. A number keeps its digits when its owner switches carrier, so the prefix no longer tells you who carries it today. Our free carrier lookup shows which carrier a 738 number is on now.

738 started in 2024 as an overlay on 323, and its ground has not changed since.

  1. 2024

    738 starts on November 1, 2024, 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.

  1. Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
  2. Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
  3. 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.
  4. Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.

The area codes closest to 738 are 818, 562 and 626.

This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.

818 / 747Van Nuys, CA562Long Beach, CA626Alhambra, CA714 / 657Anaheim, CA310 / 424Santa Monica, CA949Irvine, CA

California has 40 other area codes.

209Stockton213Los Angeles279Sacramento310Santa Monica323Los Angeles341Oakland350Stockton357Kingsburg369Santa Rosa408San Jose415San Francisco424Beverly Hills442Victorville510Oakland530Chico559Fresno562Long Beach619San Diego626Alhambra628San Francisco650Palo Alto657Anaheim661Bakersfield669San Jose707Santa Rosa714Anaheim747Burbank760Palm Springs805Santa Barbara818Van Nuys820Camarillo831Salinas837Redding840Pomona858San Diego909Ontario916Sacramento925Walnut Creek949Irvine951Riverside

Browse every US area code

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 the 738 area, phone numbers are given out in Los Angeles County.

What state is area code 738 in?

California. 738 is a California area code on Pacific Time.

What cities use area code 738?

The places holding the most 738 prefixes are Los Angeles and Montebello. The count comes from NANPA's prefix assignments as of October 1, 2026.

What time zone is area code 738 in?

738 is on Pacific Time.

When did area code 738 start?

738 went into service on November 1, 2024, as an overlay on 323: new numbers for the same area.

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.

Is 738 a toll-free number?

No. 738 is a regular area code for Los Angeles and Montebello in California, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.

What area codes are near 738?

The closest are 818/747 (Van Nuys, California), 562 (Long Beach, California), 626 (Alhambra, California) and 714/657 (Anaheim, California), measured between the centres of each area.

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.