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278 is not a working area code in the United States.

No phone number in the US or Canada starts with 278. NANPA, which runs the North American numbering plan, lists it as reserved and never assigned, as of October 1, 2026. If your phone showed a (278) number, the caller ID was faked.

Status
Reserved, never in service
Working codes one digit away
279 (Sacramento, California)

Check the number that actually called you.

Enter the full 10-digit number to see who it is listed to and the city and state on the listing. 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. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (278) number is on today, use our free carrier lookup.

A call showing (278) was almost certainly spoofed, so treat it as a robocall.

  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.

These are the questions people ask about 278.

Is 278 a real area code?

Not in the US or Canada. NANPA lists 278 as reserved and never assigned as of October 1, 2026, so no phone number in the North American plan starts with it.

Why did I get a call from a 278 number?

Because caller ID is easy to fake. Robocallers put any digits they like in the caller ID, including codes that do not exist. A call showing (278) with no country code in front was spoofed.

Which area code did they mean?

The working codes one digit away are 279 (Sacramento, California). A misdialed or mistyped number is the most common honest reason to see 278.

Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.