The 878 area code covers the same area as 412, including Pittsburgh, Pittsburgh suburbs and 10 more places in Pennsylvania.
Area code 878 is in Pennsylvania, on Eastern Time. In the 878 area, phone numbers are given out most in Allegheny County, then Westmoreland and Washington counties. It has been in service since August 17, 2001. 412 and 724 cover the same area, so two neighbours can have different area codes.
- Where
- 8 counties in Pennsylvania, mostly Allegheny County, Westmoreland County and Washington County
- Time zone
- Eastern Time
- In service since
- August 17, 2001
- Shares its area with
- 412 (since 1947) and 724 (since 1998)
- Prefixes in use
- 190
- How to dial
- Local calls need all 10 digits: 878-555-0142.
Find out who called you from an 878 number.
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 (878) number is on today, use our free carrier lookup.
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Pittsburgh holds 8% of the phone prefixes in area code 878.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 190 prefixes in use shows where 878 numbers are actually given out.
- Pittsburgh15 prefixes, 8%
- Beaver Falls9 prefixes, 5%
- Washington8 prefixes, 4%
- Rochester7 prefixes, 4%
- Greensburg7 prefixes, 4%
- Uniontown6 prefixes, 3%
- Pittsburgh suburbs5 prefixes, 3%
- Butler4 prefixes, 2%
Also served: Uniontown, Beaver Falls, Rochester and Kittanning.
Of the carriers named here, Ton80 Communications holds the most phone number prefixes in area code 878: 19 of 190.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 190 prefixes in use in 878 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Ton80 Communications | 19 | 10% |
| T-MobileMobile network | 14 | 7% |
| Fractel | 11 | 6% |
| Comcast (Xfinity)Cable company's phone service | 7 | 4% |
| AT&T MobilityMobile network | 6 | 3% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 6 | 3% |
| 29 other carriers | 127 | 67% |
100% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
878 started in 2001 as an overlay on 412, and its ground has not changed since.
2001
878 starts on August 17, 2001, as an overlay on 412: new numbers on the same ground.
An 878 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.
The area codes closest to 878 are 814, 330 and 440.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 878.
Where is area code 878?
878 covers Pittsburgh, Pittsburgh suburbs, Elizabeth and Clairton and 8 more places in Pennsylvania. In the 878 area, phone numbers are given out most in Allegheny County, then Westmoreland and Washington counties.
What state is area code 878 in?
Pennsylvania. 878 is a Pennsylvania area code on Eastern Time.
What cities use area code 878?
The places holding the most 878 prefixes are Pittsburgh, Pittsburgh suburbs, Elizabeth, Clairton, Greensburg, Washington, Butler and Indiana, out of 12 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 878?
No single phone company owns 878. NANPA's records list its 190 prefixes across many carriers, and the ones named on this page include Ton80 Communications, T-Mobile and Fractel. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 878 in?
878 is on Eastern Time.
When did area code 878 start?
878 went into service on August 17, 2001, as an overlay on 412: new numbers for the same area.
Is 878 the same area as 412 and 724?
Yes. 412 (since 1947) and 724 (since 1998) cover the same ground as 878. 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 an 878 number?
Local calls need all 10 digits: 878-555-0142.
Is 878 a toll-free number?
No. 878 is a regular area code for Pittsburgh and Pittsburgh suburbs in Pennsylvania, 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 878?
The closest are 814/582 (Erie, Pennsylvania), 330/234 (Akron, Ohio), 440/436 (Willoughby, Ohio) and 216 (Cleveland, Ohio), measured between the centres of each area.
Who called me from an 878 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 878 a scam?
878 is a real Pennsylvania 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.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.